Edison cylinder phonograph ca. 1899
A device utilizing a vibrating pen to graphically represent sound on discs of paper, without the idea of playing it back in any manner, was built by Edouard-Leon Scott of France in 1857. While the mechanism, known as a phonautograph, was intended solely to depict the visual characteristics of sound, it was recently realized that this depiction could be digitally analyzed and reconstructed as an audible recording. Just such an early phonoautogram, made in 1860 and now the earliest known audio recording, has been reproduced using computer technology.
In 1877, Thomas Edison developed the phonautograph into a machine, the phonograph, that was capable of replaying the recordings made. The recordings were made on tinfoil, and were initially intended to be used as a voice recording medium, typically for office dictation.
This phonograph cylinder dominated the recorded sound market beginning in the 1880s. Lateral-cut disc records were invented by Emile Berliner in 1888 and were used exclusively in toys until 1894, when Berliner began marketing disc records under the Berliner Gramophone label. Berliner's records had poor sound quality, however, but work by Eldridge R. Johnson improved the fidelity to a point where they were as good as cylinders. Johnson's and Berliner's separate companies merged to form the Victor Talking Machine Company, whose products would come to dominate the market for many years later.
In an attempt to head off the disc advantage, Edison introduced the Amberol cylinder in 1909, with a maximum playing time of 4 minutes (at 160 rpm) to be in turn superseded by the Blue Amberol Record whose playing surface was made of Celluloid, an early plastic which was far less fragile than the earlier wax (in fact it would have been more or less indestructible had it not been for the plaster of paris core). By November 1918 the patents for the manufacture of lateral-cut disc records expired, opening the field for countless companies to produce them, causing disc records to overtake cylinders in popularity. Edison ceased production of cylinders in 1929 (reputedly the day before the Wall Street Crash). Disc records would dominate the market until they were supplanted by the Compact Disc, starting from the early 1980s.
78 rpm disc developments
Hungarian Path record, 90 to 100 rpm
Early disc recordings were produced in a variety of speeds ranging from 60 to 120 rpm, and a variety of sizes. At least one manufacturer, Philips, produced records that played at a constant linear velocity. As these were played from the inside to the outside, the rotational speed of the record reduced as reproduction progressed (as is also true of the modern Compact Disc).
As early as 1894, Emile Berliner's United States Gramophone Company was selling single-sided 7" discs with an advertised standard speed of "about 70 rpm".
One standard audio recording handbook describes speed regulators or "governors" as being part of a wave of improvement introduced rapidly after 1897. A picture of a hand-cranked 1898 Victrola shows a governor. It says that spring drives replaced hand drives. It notes that:
"The speed regulator was furnished with an indicator that showed the speed when the machine was running so that the records, on reproduction, could be revolved at exactly the same speed...The literature does not disclose why 78 rpm was chosen for the phonograph industry, apparently this just happened to be the speed created by one of the early machines and, for no other reason continued to be used."
Record of Emile Berliner's Gramophone Company (later Deutsche Grammophon). Made 1908 in Hannover, Germany
In America in 1900, the two leading manufacturers of flat records were Columbia, which used 80 rpm as its speed, and Victor, which used 76 rpm. Since one company's records were playable on the other's machines, it is only logical that the eventual standard speed would be in the middle.
By 1925, the speed of the record became standardised at a nominal value of 78 rpm. However, the standard was to differ between America and the rest of the world. The actual 78 speed in America was 78.26 rpm, being the speed of 3600 rpm synchronous motor (run from 60 Hz supply) reduced by 46:1 gearing. Throughout the rest of the world, 77.92 rpm was adopted being the speed of a 3000 rpm synchronous motor powered by a 50 Hz supply and reduced by 38.5:1 gearing.
For a more comprehensive in-depth look at 78's, cylinders and other historic media, please visit http://78rpmrecord.com
Early recordings were made entirely acoustically, the sound being collected by a horn and piped to a diaphragm which vibrated the cutting stylus. Sensitivity and frequency range were poor, and frequency response was very irregular, giving cylinder recordings an instantly recognizable tonal quality. A singer practically had to put his face in the recording horn. Cellos and double basses were completely unrecordable. Standard Violins were barely recordable, so Stroh violins became popular with recording studios.
Contrary to popular belief, if placed properly and prepared-for, drums could be effectively used and heard on even the earliest jazz and military band recordings. The loudest instruments stood the farthest away from the collecting horn. Lillian Hardin Armstrong, a member of King Oliver's Creole Jazz Band that recorded at Gennett Records in 1923, remembered that at first Oliver and his young second trumpet, Louis Armstrong, stood next to each other and Oliver's horn couldn't be heard. "They put Louis about fifteen feet over in the corner, looking all sad."
German electrical record of the Carl Lindstrm AG
During the 1920s, engineers including Orlando R. Marsh, as well as those at Western Electric, developed technology for capturing sound with microphones, amplifying it with vacuum tubes, and using the amplified signal to drive an electromagnetic recording head. A wide frequency range could now be recorded with a big increase in playback volume limited only by the pitch of the grooves in the record.
Although the technology used vacuum tubes and today would be described as "electronic", at the time it was referred to as "electrical". A 1926 Wanamaker's ad in The New York Times offers records "by the latest Victor process of electrical recording". It was recognized as a breakthrough; in , a Times music critic stated:
"...the time has come for serious musical criticism to take account of performances of great music reproduced by means of the records. To claim that the records of succeeded in exact and complete reproduction of all details of symphonic or operatic performances... would be extravagant. [But] the article of today is so far in advance of the old machines as hardly to admit classification under the same name. Electrical recording and reproduction have combined to retain vitality and color in recitals by proxy."
Peter Carl Goldmark (Hungarian: Goldmark Pter Kroly) was a Hungarian engineer who, during his time with Columbia Records, was instrumental in developing the long-playing (LP) microgroove 3313 rpm vinyl phonograph discs which defined home audio for two generations.
Example of Congolese 78 rpm records
A 10-inch gramophone blank for self recording with 78 rpm, brand as material "Decelith" with special surface for hardening
Electrical recording preceded electrical home reproduction (much as digital recording preceded digital home reproduction), because of the initial high cost of the electronics. In 1925, the Victor company introduced the groundbreaking Victor Orthophonic Victrola, an acoustical record player that was specifically designed to play electrically recorded discs, as part of a line that also included electrically-reproducing "Electrolas." The acoustical Orthophonics ranged in price from US to 0 (about US40 to 00 in year 2007 dollars), depending on cabinetry; by comparison, the cheapest Electrola cost US0 (about US00 in year 2007 dollars).
The Orthophonic had an interior folded exponential horn, a sophisticated design informed by impedance-matching and transmission-line theory, and designed to provide a relatively flat frequency response. Its first public demonstration was front-page news in the New York Times, which reported that:
"The audience broke into applause... John Philip Sousa [said]: 'Gentleman [sic], that is a band. This is the first time I have ever heard music with any soul to it produced by a mechanical talking machine.' ... The new instrument is a feat of mathematics and physics. It is not the result of innumerable experiments, but was worked out on paper in advance of being built in the laboratory.... The new machine has a range of from 100 to 5,000 frequencies[sic], or five and a half octaves.... The 'phonograph tone' is eliminated by the new recording and reproducing process."
Gradually, electrical reproduction entered the home. The clockwork motor was replaced by an electric motor; the 'needle' and diaphragm (the 'sound box') was replaced with a 'pickup' using either a steel or sapphire stylus, and a transducer to convert the groove vibrations into an electrical signal. The exponential horn became an amplifier and loudspeaker.
78 rpm materials
Early disc records were made of various materials including hard rubber. From 1897 onwards, earlier materials were largely replaced by a rather brittle formula of 25% shellac, a filler of a cotton compound similar to manila paper, powdered slate, and a small amount of a wax lubricant.
The mass production of shellac records began in 1898 in Hanover, Germany, and continued until the end of the 78 rpm format in the late 1950s. "Unbreakable" records, usually of celluloid on a pasteboard base, were made from 1904 onwards, but they suffered from an exceptionally high level of surface noise. "Unbreakable" records could be bent, broken, or otherwise damaged; but not nearly as easily as shellac records. Vinyl was first tried out as a 78 rpm material in 1939, as a cigarette radio commercial mailed to stations, as vinyl was less breakable in the mail. On the record, mention is made of the Lucky Strike exhibit at the 1939 NY World's Fair. Decca introduced vinyl "Deccalite" 78s after the Second World War. During the war, the US Armed Forces produced thousands of V-Discs for the soldiers to play overseas, as well as giant 16-inch War Department radio transcriptions, all of which were made of vinyl. Victor made some vinyl 78s, but other labels would restrict vinyl production to the special DJ copies of 78's, which were also commonly issued in vinyl to be mailed to radio stations, during the late 40's and early 50's. Finally, 78 reissues have been manufactured in vinyl since the 1990s for juke box collectors, by Rhino Records. Care should be made never to play vinyl 78's on a victrola, as it will destroy them.
78 rpm disc size
In the 1890s, the early recording formats of discs were usually seven inches (nominally 17.5 cm) in diameter. By 1910 the 10-inch (25.4 cm) record was by far the most popular standard, holding about three minutes of music or entertainment on a side. From 1903 onwards, 12-inch records (30.5 cm) were also sold commercially, mostly of classical music or operatic selections, with four to five minutes of music per side. (Victor, Brunswick and Columbia also issued 12" popular medleys, usually spotlighting a Broadway show score.) However, other sizes did appear. 8 inch discs with a 2 inch diameter label became popular for about a decade in Britain, they cannot be played in full on most modern record players because the tone arm can't reach far enough without modification to the equipment.
78 rpm recording time
The playing time of a phonograph record depended on the turntable speed and the groove spacing. At the beginning of the 20th century, the early discs played for two minutes, the same as early cylinder records. The 12-inch disc, introduced by Victor in 1903, increased the playing time to three and a half minutes. Because a 10-inch 78 rpm record could hold about three minutes of sound per side and the 10-inch size was the standard size for popular music, almost all popular recordings were limited to around three minutes in length.
For example, when King Oliver's Creole Jazz Band, including Louis Armstrong on his first recordings, recorded 13 sides at Gennett Records in Richmond, Indiana, in 1923, one side was 2:09 and four sides were 2:522:59.
By 1938, when Milt Gabler started recording on January 17 for his new label, Commodore Records, to allow longer continuous performances, he recorded some 12" records. Eddie Condon explained: "Gabler realized that a jam session needs room for development." The first two 12" recordings did not take advantage of the extra length: "Carnegie Drag" was 3:15; "Carnegie Jump", 2:41. But, at the second session, on April 30, the two 12" recordings were longer: "Embraceable You" was 4:05; "Serenade to a Shylock", 4:32.
Another way around the time limitation was to issue a selection on both sides of a single record. Vaudeville stars Gallagher and Shean, recorded "Mr. Gallagher and Mr. Shean", written by Irving and Jack Kaufman, as two-sides of a 10" 78 in 1922 for Cameo.
An obvious workaround for longer recordings was to release a set of records. The first multi-record release was in 1903, when HMV in England made the first complete recording of an opera, Verdi's Ernani, on 40 single-sided discs. In 1940, Commodore released Eddie Condon and his Band's recording of "A Good Man Is Hard to Find" in four parts, issued on both sides of two 12" 78s.
This limitation on the length of both popular-music and jazz numbers persisted from 1910 until the invention of the LP, in 1948.
In popular music, this time limitation of about 3:30 on a 10" 78 rpm record meant that singers usually did not release long pieces on record. One exception is Frank Sinatra's recording of Rodgers and Hammerstein's "Soliloquy", from Carousel, made on May 28, 1946. Because it ran 7:57, longer than both sides of a standard 78 rpm 10" record, it was released on Columbia's Masterwork label (the classical division) as two sides of a 12" record. (See date.)
In the 78 era, classical-music and spoken-word items generally were released on the longer 12" 78s, about 45 minutes per side. For example, on June 10, 1924, four months after the February 12 premier of Rhapsody in Blue, George Gershwin recorded it with Paul Whiteman and His Orchestra. It was released on two sides of Victor 55225 and runs 8:59. Look under the title
Such 78 rpm records were usually sold separately, in brown paper or cardboard sleeves that were sometimes plain and sometimes printed to show the producer or the retailer's name. Generally the sleeves had a circular cut-out allowing the record label to be seen. Records could be laid on a shelf horizontally or stood upright on an edge, but because of their fragility, many broke in storage.
German record company Odeon is often said to have pioneered the "album" in 1909 when it released the "Nutcracker Suite" by Tchaikovsky on 4 double-sided discs in a specially-designed package. (It is not indicated what size the records are.) However, Deutsche Grammophon had produced an album for its complete recording of the opera Carmen in the previous year. The practice of issuing albums does not seem to have been widely taken up by other record companies for many years; however, HMV provided an album, with a pictorial cover, for the 1917 recording of The Mikado (Gilbert & Sullivan).
By about 1910[note 1] bound collections of empty sleeves with a cardboard or leather cover, similar to a photograph album, were sold as "record albums" that customers could use to store their records (the term "record album" was printed on some covers). These albums came in both 10" and 12" sizes. The covers of these bound books were wider and taller than the records inside, allowing the record album to be placed on a shelf upright, like a book, suspending the fragile records above the shelf and protecting them.
Starting in the 1930s, record companies began issuing collections of 78 rpm records by one performer or of one type of music in specially assembled albums, typically with artwork on the front cover and liner notes on the back or inside cover. Most albums included 3 or 4 records, with 2 sides each, making 6 or 8 songs per album. When the 12-inch vinyl LP era began in 1949, the single record often had the same or similar number of songs as a typical album of 78's, which gave rise to the tradition of the term "album" being given to the LP.
New sizes and materials
A modern 12" vinyl album being played. Note the stylus's contact with the surface.
Both the microgroove LP 33 rpm record and the 45 rpm single records are made from vinyl plastic that is flexible and unbreakable in normal use. However, the vinyl records are easier to scratch or gouge, and much more prone to warping.
In 1931, RCA Victor (which evolved from the Johnson and Berliner's Victor Talking Machine Company) launched the first commercially available vinyl long-playing record, marketed as "Program Transcription" discs. These revolutionary discs were designed for playback at 33 rpm and pressed on a 30 cm diameter flexible plastic disc, with a duration of about ten minutes playing time per side. In Roland Gelatt's book The Fabulous Phonograph, the author notes that RCA Victor's early introduction of a long-play disc was a commercial failure for several reasons including the lack of affordable, reliable consumer playback equipment and consumer wariness during the Great Depression. Because of financial hardships that plagued the recording industry during that period (and RCA's own parched revenues), Victor's "long playing" records were quietly discontinued by early 1933.
There was also a small batch of "longer playing" records issued in the very early 1930s: Columbia introduced 10" 'longer playing' records (18000-D series), as well as a series of double-grooved or longer playing 10" records on their Harmony, Clarion & Velvet Tone cheap labels. All of these were phased out in mid-1932.
However, vinyl's lower surface noise level than shellac was not forgotten, nor was its durability. In the late '30s, radio commercials and pre-recorded radio programs being sent to disc jockeys started being stamped in vinyl, so they would not break in the mail. In the mid-1940s, special DJ copies of records started being made of vinyl also, for the same reason. These were all 78 rpm. During and after World War II, when shellac supplies were extremely limited, some 78 rpm records were pressed in vinyl instead of shellac, particularly the six-minute 12-inch (30 cm) 78 rpm records produced by V-Disc for distribution to US troops in World War II. In the '40s, radio transcriptions, which were usually on 16-inch records, but sometimes 12-inch, were always made of vinyl, but cut at 33 rpm. Shorter transcriptions were often cut at 78 rpm.
Beginning in 1939, Dr. Peter Goldmark and his staff at Columbia Records undertook efforts to address problems of recording and playing back narrow grooves and developing an inexpensive, reliable consumer playback system. In 1948, the 12-inch (30 cm) Long Play (LP) 33 rpm microgroove record album was introduced by the Columbia Record Company at a New York press conference on June 21, 1948. In February 1949, RCA Victor released the first 45 rpm single, 7 inches in diameter, with a large center hole to accommodate an automatic play mechanism on the changer, so a stack of singles would drop down one record at a time automatically after each play. Early 45 rpm records were made from either vinyl or polystyrene. They had a playing time of eight minutes.
On a small number of early phonograph systems and radio transcription discs, as well as some entire albums, the direction of the groove is reversed, beginning near the center of the disc and leading to the outside. A small number of records (such as Jeff Mills' Apollo EP or the Hidden In Plainsight EP from Detroit's Underground Resistance) were manufactured with multiple separate grooves to differentiate the tracks (usually called 'NSC-X2').
Edison Records "Diamond Disc" label, early 1920s. Edison Disc Records always ran at 80 rpm.
The earliest rotation speeds varied widely. Most records made in 19001925 were recorded at 7482 revolutions per minute (rpm). Edison Disc Records consistently ran at 80 rpm.
However a few unusual systems were deployed. The Dutch Philips company introduced records whose rotational speed varied such that the reproducing "needle" ran at a constant linear velocity (CLV) in the groove. These records, also unusually, played from the inside to the outside. Both of these features were later to be found in the modern day compact disc, which itself was also invented by Philips. The London Science Museum displays a Philips CLV record marked as "Speed D".
In 1925, 78.26 rpm was chosen as the standard because of the introduction of the electrically powered synchronous turntable motor. This motor ran at 3600 rpm, such that a 46:1 gear ratio would produce 78.26 rpm. In parts of the world that used 50 Hz current, the standard was 77.92 rpm (3000 rpm with a 38.5:1 ratio), which was also the speed at which a strobe disc with 77 lines would "stand still" in 50 Hz light (92 lines for 60Hz). After World War II these records were retroactively known as 78s, to distinguish them from other newer disc record formats. Earlier they were just called records, or when there was a need to distinguish them from cylinders, disc records.
Columbia and RCA's competition extended to equipment. Some turntables included spindle size adapters, but other turntables required snap-in inserts like this one to adapt RCA's larger 45 rpm spindle size to the smaller spindle size available on nearly all turntables. Shown is one popular design in use for many years.
After World War II, two new competing formats came on to the market and gradually replaced the standard "78": the 33 rpm (often just referred to as the 33 rpm), and the 45 rpm (see above). The 33 rpm LP (for "long play") format was developed by Columbia Records and marketed in 1948. RCA Victor developed the 45 rpm format and marketed it in 1949, in response to Columbia. Both types of new disc used narrower grooves, intended to be played with smaller styliypically 0.001 inches (25 m) wide, compared to 0.003 inches (76 m) for a 78o the new records were sometimes called Microgroove. In the mid-1950s all record companies agreed to a common recording standard called RIAA equalization. Prior to the establishment of the standard each company used its own preferred standard, requiring discriminating listeners to use pre-amplifiers with multiple selectable equalization curves.
While stroboscopic speed checkers can be used to correctly adjust a turntable speed to 45 rpm in the US where the stroboscope disc is illuminated by a lamp run from a 60 Hz supply, most strobes are slightly inaccurate where there is a 50 Hz supply. Using a conventional single segment per pulse, the nearest that can be achieved is 45.112+ rpm which requires a disc with 133 segments. The difference amounts to the record sounding sharp by about a twenty fifth of a semitone (i.e. practically unnoticeable). To construct a 50 Hz stroboscope disc that appears stationary at exactly 45 rpm is possible, and would require 400 segments advancing by 3 segments on each pulse of light.
A number of recordings were pressed at 16 rpm (usually a 7-inch disc, visually identical to a 45 rpm single). Peter Goldmark, the man who developed the 33 rpm record, developed the Highway Hi-Fi 16 rpm record to be played in Chrysler automobiles, but poor performance of the system and weak implementation by Chrysler and Columbia led to the demise of the 16 rpm records. Subsequently, the 16 rpm speed was used for radio transcription discs or narrated publications for the blind and visually impaired, and were never widely commercially available, although it was common to see new turntable models with a 16 rpm speed setting produced as late as the 1970s.
1959 Seeburg 16 rpm record
Seeburg Corporation introduced the Seeburg Background Music System in 1959, using a 16 rpm 9-inch record with 2-inch center hole. Each record held 40 minutes of music per side, recorded at 420 grooves per inch.
The older 78 format continued to be mass produced alongside the newer formats until about 1960 in the US, and in a few countries, such as India (where some Beatles recordings were issued on 78), into the 1960s. For example, Columbia Records' last reissue of Frank Sinatra songs on 78 rpm records was an album called "Young at Heart", issued November 1, 1954. As late as the 1970s, some children's records were released at the 78 rpm speed. In the United Kingdom, the 78 rpm single lasted longer than in the United States and the 45 rpm took longer to become popular. The 78 rpm was overtaken in popularity by the 45 rpm in the late 1950s, as teenagers became increasingly affluent, although some of Elvis Presley's early singles sold more copies on 78 than on 45. The last new 78 rpm singles in the UK were released in March 1960 and production ceased in 1961.
The commercial rivalry between RCA Victor and Columbia Records led to RCA Victor's introduction of what it had intended to be a competing vinyl format, the 7-inch (175 mm) 45 rpm disc. For a two-year period from 1948 to 1950, record companies and consumers faced uncertainty over which of these formats would ultimately prevail in what was known as the "War of the Speeds". (See also format war.) In 1949 Capitol and Decca adopted the new LP format and RCA gave in and issued its first LP in January 1950. But the 45 rpm size was gaining in popularity, too, and Columbia issued its first 45s in February 1951. By 1954, 200 million 45s had been sold.
Eventually the 12-inch (300 mm) 33 rpm LP prevailed as the predominant format for musical albums and 10" LPs were no longer issued. The last Columbia Records reissue of any Frank Sinatra songs on a 10" LP record was an album called "Hall of Fame", CL 2600, issued October 26, 1956, containing six songs, one each by Tony Bennett, Rosemary Clooney, Johnny Ray, Frank Sinatra, Doris Day, and Frankie Laine. The 10" LP however had a longer life in the United Kingdom, where important early British rock and roll albums such as Lonnie Donegan's Lonnie Donegan Showcase and Billy Fury's The Sound of Fury were released in that form. The 7-inch (175 mm) 45 rpm disc or "single" established a significant niche for shorter duration discs, typically containing one item on each side. The 45 rpm discs typically emulated the playing time of the former 78 rpm discs, while the 12" LP discs provided up to one half hour of time per side. The amount of music per LP varied from label to label and possibly from performer to performer. Frank Sinatra's "A Swinging Affair", a monaural album, contained 15 songs and ran 50 minutes. Other albums by other performers could run as little as 30 or 35 minutes. After the introduction of stereophonic recording, record times dropped because, presumably, the early stereo groove was wider than the monaural groove.
A stroboscopic disc for 33 and 45 rpm (actually 44.77 rpm as it has the wrong number of segments on the 45 ring) at 50 Hz
The 45 rpm discs also came in a variety known as extended play (EP) which achieved up to 1015 minutes play at the expense of attenuating (and possibly compressing) the sound to reduce the width required by the groove. EP discs were generally used to reissue LP albums on the smaller format for those people who had only 45 rpm players. LP albums could be purchased 1 EP at a time, with four items per EP, or in a boxed set with 3 EPs or 12 items. The large center hole on 45s allows for easier handling by jukebox mechanisms. EPs were generally discontinued by the late 1950s as three- and four-speed record players replaced the individual 45 players. One indication of the decline of the 45 rpm EP is that the last Columbia Records reissue of Frank Sinatra songs on 45 rpm EP records, called "Frank Sinatra" (Columbia B-2641) was issued December 7, 1959. However, the EP lasted considerably longer in Europe, and was a popular format during the 1960s for recordings by artists such as Serge Gainsbourg and the Beatles.
In the late 1940s and early 1950s, 45 rpm-only players that lacked speakers and plugged into a jack on the back of a radio were widely available. Eventually, they were replaced by the threepeed record player.
From the mid-1950s through the 1960s, in the U.S. the common home "record player" or "stereo" (after the introduction of stereo recording) would typically have had these features: a three- or four-speed player (78, 45, 33, and sometimes 16 rpm); with changer, a tall spindle that would hold several records and automatically drop a new record on top of the previous one when it had finished playing, a combination cartridge with both 78 and microgroove styli and a way to flip between the two; and some kind of adapter for playing the 45s with their larger center hole. The adapter could be a small solid circle that fit onto the bottom of the spindle (meaning only one 45 could be played at a time) or a larger adaptor that fit over the entire spindle, permitting a stack of 45s to be played.
RCA 45s were also adapted to the smaller spindle of an LP player with a plastic snap-in insert known as a "spider". These inserts, commissioned by RCA president David Sarnoff and invented by Thomas Hutchison, were prevalent starting in the 1960s, selling in the tens of millions per year during the 45's heyday. In countries outside of the US, 45s often had the smaller album-sized holes (e.g. Australia and New Zealand), or otherwise a pseudo-spider was "built-in" to the record, which could be punched out if desired (ie the United Kingdom, especially before the 1970s).
Deliberately playing or recording records at a higher speed gave an antic quirkiness to voices; doing so at a slower speed changed music and voice to an ominous, growling tone. Canadian musician Nash the Slash also took advantage of this speed/tonal effect with his 1981 12-inch disc Decomposing, which featured four instrumental tracks that were engineered to play at any speed (with the playing times listed for 33, 45 and 78 rpm playback).
As the LP became established as the dominant size for longer recordings, several developments were made to enhance the sound.
The first of these was the attempt to develop high fidelity, or hi-fi, sound.
In the late `20's and early `30's, since vertical modulation was considered the higher fidelity medium due to its' immunity of picking up common lateral turntable rumble, caused by the rubber puck driving the edge of the turntable rim, an earlier version of the Cook binaural system (described below in Stereo) was experimented with as well, but for high-fidelity, not for stereo (at least not yet).
This system utilized vertical modulation in the smaller space near the center of the disc for the bass portion of the program, starting from halfway through the disc going to the label avoiding inner-groove distortion, and used lateral modulation for the treble portion of the program in the larger space from the edge of the disc to halfway through for the treble portion of the program. This meant that the lateral turntable rumble could be filtered out of the treble electronically by a crossover network and the crackle and static of the treble could be filtered out of the bass by the same process.
Since vertical pickups were harder to come by and took up more space than their lateral counterparts, experiments were soon underway to record both the bass and the treble portions of a high-fidelity program in their own separate grooves in a lateral fashion on the same side of the disc. Utilizing a two-channel amplifier and speaker system, with one channel driving the wide-range woofer, and one channel driving the combination wide-range midrange and tweeter, true wide-range high-fidelity would be achieved. The format was only experimental but, it wasn't long before this system was adapted once again for early Stereo (see below).
People who were concerned with hearing all the quality sound now embedded in the new LPs began to buy separate turntables, amplifiers, speakers and woofers to get the best sound possible.
Stan Freberg satirized these fans in his 1956 radio show with a skit about a man who turned his whole house into a speaker.
Flanders & Swann also poked fun at installing the components necessary for high fidelity in their Song of Reproduction.
(In 1931, Victor experimented with a high-fidelity microphone recording system and a number of records issued in the 22900 and 24000 series were surprisingly "hi-fi". However, the records were too loud and 'blasty' on most home reproducers, and after getting complaints from their dealers, Victor stopped using this equipment in their New York and Camden studios around mid-1932 and sent it to their Chicago studio, where it continued to be used until about 1934.)
In 1957 the first commercial stereo two-channel records were issued on translucent blue vinyl by Bel Canto, the first of which is a highly-collectible multi-colored-vinyl sampler featuring `A Stereophonic Tour of Los Angeles' narrated by Jack Wagner on one side, and a collection of tracks from various Bel Canto albums on the back.
Following in 1958, more Stereo LP releases were offered by Audio Fidelity in the USA and Pye in Britain, using the Westrex "45/45" single-groove system.
While the stylus moves horizontally when reproducing a monophonic disk recording, on stereo records the stylus moves vertically as well as horizontally. In fact, prior to the full development of the 45/45 system, the first stereo cutting heads were made by bolting together one lateral cut head and one vertical cut head sharing a common stylus holder. Feeding the driving coils with suitably phased material, a practice which would later give rise to the matrices used in quadraphony, achieved the 45/45 groove.
See also http://78rpmrecord.com/altformat.htm
rill with sound only on left channel
One could envision a system in which the left channel was recorded laterally, as on a monophonic recording, with the right channel information recorded with a "hill-and-dale" vertical motion; such systems were proposed but not adopted, due to their incompatibility with existing phono pickup designs (see below). Prior to these experiments, the lateral and vertical portions of the groove were experimented with in a discrete twin-groove system described below.
However, before this lateral-vertical single-groove system was experimented with for stereo reproduction, its' components were adopted for other uses, namely many radio station music transcriptions used the vertical modulation portion with its' higher fidelity and being less susceptible to rumble, and lateral portion for speech, as the rumble could be filtered out electronically and not affect the program.
Also by the mid-`50's, an audio engineer by the name of Mintner grew tired of the incompatibility of the vertical portion of Stereo records and their susceptibility of damage when played with a mono vertically-noncompliant cartridge and stylus and came up with a way to have both channels recorded laterally and in the same groove.
Due to the frequency limitations of cutting heads of the period, the disc needed to be mastered at 16-2/3 RPM for playback at 33-1/3 RPM, a practice which would later be adapted and improved in the 70's, coupled with 180 gram super thick virgin vinyl to create Half Speed Mastered audiophile LPs.
Similar to lateral-vertical stereo played through a 45-45 stereo system, Mintner left the normal mono signal in the normal frequency range of 20Hz-20KHz, ensuring compatibility with normal mono players of the period, and then moved the difference signal up to a supersonic band of 20KHz-45KHz by modulating a 30KHz carrier signal engraved on the disc. A carrier detector and de-matrix circuit, similar to what would later be used for FM Multiplex Stereo sensed the carrier wave, stripped it off, retrieved the signal and then matrixed it with the original mono signal to create stereo.
Unfortunately, the development of lightweight pickup arms was still many years away in the future, and so the heavy weight of pickup arms in the 50's caused the carrier wave on the record to be completely destroyed after only a few plays. But, both the modulated carrier wave and matrix-encoding systems used herein would later be multiplied by two and used as CD-4 and SQ/QS respectively in quadraphonic.
Another early-stereo experimental engraved the left channel of the program on the left (top) side of the disc running conventionally in a clockwise format, and the right channel engraved on the right (bottom) side of the disc in a counterclockwise fashion. This was accomplished simply by flipping the stylus round front-to-back in the recording head, and introducing a figure-8 flip in the lathe drive belt, causing the recording to still be made outside-in but in reverse.
To play the disc, a pedal was depressed to separate the twin gramophone heads which faced one another across the turntable and load the disc vertically as in a jukebox. Then the pedal was very carefully released again in order to set the heads upon the disc for play. As the pedals were spring loaded, most of the records were destroyed by the two heavy gramophone heads crashing into the disc when the load pedal was released.
The format died mainly because of the brittleness of 78's as described above, and also due to the fact that some discs were produced in an offset format for players with heads at opposite sides of the turntable, while others were produced for playback on machines with gramophone heads on the same side. Playing a disc made for one on a player made for the other would induce a half-revolution difference in the program, similar to trying to play a manual-sequence album on a changer where the sides would be out of sequence.
Utilizing another technique borrowed from vintage Vitaphone recordings which accompanied sound films in the `20's before the advent of sound-on-film, arrows were inscribed on the master indicating the start of the lead-in groove. Stampers could then be either aligned with or staggered from one another fpr production, which incidentally, due to the exacting care needed for stamper alignment was accomplished at the long-dormant and exact same Vitaphone disc production facilities which produced the originals.
For a good visual of the early problems associated with Vitaphone, see the recording scene and the movie-preview scene of Gene Kelly in MGM's Singin' in the Rain. Unlike most phonograph discs, the needle on Vitaphone records moved from the inside of the disc to the outside, a practice which would be half-borrowed by live recording engineers of those pre-tape days, recording odd sides of a live performance conventionally outside-in, and even sides of a program inside-out back and forth between twin disc recording lathes. When plated and pressed, these discs were produced with a hybrid of manual-operator and automatic-changer sequence called DJ disc sequence so that at all times an operator would never have to flip a disc over in order to continue.
This inline/staggered heads idea from twin-sided stereo shellacque 78's would later be utilized in competing home-stereo tape recording formats of the early 50's, once again, one machine being unable to play stereo recordings made on the other. This time, however one format, Inline, won out.
After laying dormant for over 40 years, this idea of having one head on the front of a disc and one head on the back was picked up in the 70's by Sharp Electronics and used in a space-saving turntable design to play both sides of a vertically-oriented LP in sequence without having to move the stylus from one side to the other (as in a two-sided Laser-Disc player where the pickup travels from bottom to top to play the other side). Each side had its' own cartridge and stylus, and the three-inch platter could spin in either direction allowing for as much as 45 minutes of uninterrupted music.
The Cook twin-groove stereo system borrowed from this but put both grooves on the same side of the disc, engraving the left channel of the groove beginning near the edge of the disc and the right channel beginning near a point halfway through the recording and concluding near the label. A twin-lateral pickup was used for playback.
In the Westrex system, the lateral-vertical system described above is tilted 45 degrees, allowing each channel to drive the cutting head at a 45 degree angle to the vertical, sharing equally in both the lateral and vertical modulations and eliminating the need for a matrix when encoding from a stereo source.
During playback the combined signal is sensed by a left channel coil mounted diagonally opposite the inner side of the groove, and a right channel coil mounted diagonally opposite the outer side of the groove.
It is helpful to think of the combined stylus motion in terms of the vector sum and difference of the two stereo channels. Effectively, all vertical stylus motion conveys the L-R difference signal, and horizontal stylus motion carries the L+R summed signal.
The advantages of the 45/45 system are:
greater compatibility with monophonic recording and playback systems. A monophonic cartridge will reproduce an equal blend of the left and right channels instead of reproducing only one channel. (However many monophonic styli would damage a stereo groove, leading to the common recommendation to never use a mono cartridge on a stereo record.) Conversely, a stereo cartridge reproduces the lateral grooves of monophonic recording equally through both channels, rather than one channel.
a more balanced sound, because the two channels have equal fidelity (rather than providing one higher-fidelity vertically recorded channel and one lower-fidelity laterally recorded channel);
higher fidelity in general, because the "difference" signal is usually of low power and thus less affected by the intrinsic distortion of hill-and-dale recording.
This system was invented by Alan Blumlein of EMI in 1931 and patented the same year. EMI cut the first stereo test discs using the system in 1933 see Bell Labs Stereo Experiments of 1933. It was not used commercially until a quarter of a century later.
Stereo sound provides a more natural listening experience where the spatial location of the source of a sound is, at least in part, reproduced.
Under the direction of recording engineer C. Robert Fine, Mercury Records initiated a minimalist single microphone monaural recording technique in 1951. The first record, Kubelik/Chicago's performance of "Pictures at an Exhibition" was described as "being in the living presence of the orchestra" by The New York Times music critic. The series of records was then named ercury Living Presence. In 1955 Mercury began three-channel stereo recordings, still based on the principle of the single microphone. The center (single) microphone was of paramount importance, with the two side mics adding depth and space. Record masters were cut directly from a three-track to two-track mixdown console, with all editing of the master tapes done on the original three-tracks. In 1961 Mercury enhanced this technique with three-microphone stereo recordings using 35 mm magnetic film instead of half-inch tape for recording. The greater thickness and width of 35 mm magnetic film prevented tape layer print-through and pre-echo and gained extended frequency range and transient response. The Mercury Living Presence recordings were remastered to CD in the 1990s by the original producer, Wilma Cozart Fine, using the same method of 3-to-2 mix directly to the master recorder.
The development of quadraphonic records was announced in 1971. These recorded four separate sound signals. This was achieved on the two stereo channels by electronic matrixing, where the additional channels were combined into the main signal. When the records were played, phase-detection circuits in the amplifiers were able to decode the signals into four separate channels. There were two main systems of matrixed quadraphonic records produced, confusingly named SQ (by CBS) and QS (by Sansui). They proved commercially unsuccessful, but were an important precursor to later "surround sound" systems, as seen in SACD and home cinema today. A different format, CD-4 (not to be confused with compact disc), by RCA, encoded rear channel information on an ultrasonic carrier, which required a special wideband cartridge to capture it on carefully-calibrated pickup arm/turntable combinations. Typically the high frequency information inscribed onto these LPs wore off after only a few playings, and CD-4 was even less successful than the two matrixed formats. (A further problem was that no cutting heads were available that could handle the HF information. That was got round by cutting at 'half-speed'. Later, the special half-speed cutting heads and equalization techniques were employed to get a wider frequency response in stereo with reduced distortion and greater headroom.)
Through the 1960s, 1970s and 1980s, various methods to improve the dynamic range of mass produced records involved highly advanced disc cutting equipment. These techniques, marketed, to name two, as the CBS DisComputer and Teldec Direct Metal Mastering, were used to reduce inner-groove distortion. RCA Victor introduced another system to boost dynamic range and achieve a groove with less surface noise under the commercial name of Dynagroove. Two main elements were combined: another disk material with less surface noise in the groove and dynamic compression for masking background noise. Sometimes this was called "diaphragming" the source material and not favoured by some music lovers for its unnatural side effects. Both elements were reflected in the brandname of Dynagroove, described elsewhere in more detail. It also used the earlier advanced method of forward looking control on track distance with respect to volume of sound and position on the disk. Tracks were close to each other with lower volumes and farther away with loud passages, especially for the bass. Also the higher track density at lower volumes enabled disk recordings to end farther away from the inner circle than usual, helping to reduce endtrack distortion even further.
Also in the late 1970s, "direct-to-disc" records were produced, aimed at an audiophile niche market. These completely bypassed the use of magnetic tape in favour of a "purist" transcription directly to the master lacquer disc. Also during this period, "half-speed mastered" and "original master" records were released, using expensive state-of-the-art technology. A further late 1970s development was the Disco Eye-Cued system used mainly on Motown 12-inch singles released between 1978 and 1980. The introduction, drum-breaks or choruses of a track were indicated by widely separated grooves, giving a visual clue to DJs mixing the records. The appearance of these records is similar to an LP, but they only contain one track each side.
The early 1980s saw the introduction of "dbx-encoded" records, again for the audiophile niche market. These were completely incompatible with standard record playback preamplifiers, relying on the dbx compandor encoding/decoding scheme to greatly increase dynamic range (dbx encoded disks were recorded with the dynamic range compressed by a factor of two in dB: quiet sounds were meant to be played back at low gain and loud sounds were meant to be played back at high gain, via automatic gain control in the playback equipment; this reduced the effect of surface noise on quiet passages). A similar and very short lived scheme involved using the CBS-developed "CX" noise reduction encoding/decoding scheme.
Main article: Laser turntable
ELPJ, a Japanese-based company, has developed a player that uses a laser instead of a stylus to read vinyl discs. In theory the laser turntable eliminates the possibility of scratches and attendant degradation of the sound, but its expense limits use primarily to digital archiving of analog records and the laser does not recognize colored vinyl or picture disk. Various other laser-based turntables were tried during the 1990s, but while a laser reads the groove very accurately, since it does not touch the record, the dust that vinyl naturally attracts due to static charge is not cleaned from the groove, worsening sound quality in casual use compared to conventional stylus playback.
Loosely connected to the laser turntable is the IRENE http://irene.lbl.gov/ invented by a team of physicists at Lawrence Berkeley Laboratories to retrieve the information from any laterally-modulated monaural grooved sound source without touching the media itself.
However, IRENE is only good for mono, lateral recordings. For vertically-modulated grooved media such as cylinders and some radio transcriptions which feature a hill-and-dale format of recording, or for stereophonic or quadraphonic grooved recordings which utilize a combination of the two as well as supersonic encoding for quadraphonic, this would not work.
Enter the IRENE progeny, the Confocal Microscope Cylinder Project http://www.flickr.com/photos/kqedquest/2711763438/ which capture a high resolution 3-D image of the surface, down to 200M. In order to convert to a digital sound file, this is then played by a version of the same `virtual stylus' program developed by the research team in real-time, converted to digital and, if desired, processed through sound-restoration programs.
However, before final playback in the computer to convert to digital audio files in real-time, it is also possible to remove many of the sonic imperfections in the media while still in the video domain, by utilizing the same tools as major motion picture studios in restoring their films. The result is truly stunning.
The protective cover of the one-off Voyager Golden Record, containing symbolic information on how it is to be played.
Types of records
See also: Recording medium comparison
See also http://78rpmrecord.com/altformat.htm
As recording technology evolved, more specific terms for various types of phonograph records were used in order to describe some aspect of the record: either its correct rotational speed ("16 rpm" (revolutions per minute), "33 rpm", "45 rpm", "78 rpm") or the material used (particularly "vinyl" to refer to records made of polyvinyl chloride, or the earlier "shellac records" generally the main ingredient in 78s). Other terms such as "Long Play" or L.P. and "Extended Play" or E.P. describe multi-track records that play a lot longer than the single-item-per-side records, which typically don't go much past 4 minutes per side. An L.P. can play for about thirty minutes per side. The 7" 45 rpm format normally contains one item per side but a 7" EP could achieve recording times of 10 to 15 minutes at the expense of attenuating and compressing the sound to reduce the width required by the groove. EP discs were generally used to make available tracks not on singles including tracks on LPs albums in a smaller, less expensive format for those who had only 45 rpm players. The large center hole on 7" 45 rpm records allows for easier handling by jukebox mechanisms. The term "album," originally used to mean a "book" with liner notes, holding several 78 rpm records each in its own "page" or sleeve, no longer has any relation to the physical format: a single LP record, or nowadays more typically a compact disc.
Sizes of records in America and the UK are generally measured in inches, usually represented with a double prime symbol, e.g. a 7-inch or 7" record which are generally 45 rpm records. LPs were 10" records at first, but soon the 12" size became by far the most common with 78s generally being 10" but also 12" and 7" and even smallerhe so called 'little wonders.'
Revolutions per minute
12 in. (30 cm)
45 min Long play (LP)
12-inch single, Maxi Single, and Extended play (EP)
10 in. (25 cm)
Long play (LP)
7 in. (17.5 cm)
Single, and Extended play (EP)
Often used for children's records in the 1960s and 1970s.
Before the early 1950s, the 33 rpm LP was most commonly found in a 10-inch (25 cm) format.
The 10-inch format disappeared from United States stores around 1950, but remained a common
format in some markets until the mid-1960s. The 10-inch vinyl format was resurrected in the 1970s
for marketing some popular recordings as collectibles, and these are occasionally seen today.
The maximum time per side for an LP is only achievable with special playback styli,
so cutting engineers often dislike cutting such grooves.
Less common formats
Main article: Unusual types of gramophone records
A standard wide-hole 7" vinyl record from 1978 on its respective sleeve.
The normal commercial disc is engraved with two sound-bearing concentric spiral grooves, one on each side of the disc, running from the outside edge towards the centre. The last part of the spiral meets an earlier part to form a circle. The sound is encoded by fine variations in the edges of the groove that cause a stylus (needle) placed in it to vibrate at acoustic frequencies when the disc is rotated at the correct speed. Generally, the outer and inner parts of the groove bear no intended sound (at least one exception is Split Enz's Mental Notes).
Since the late 1910s, both sides of the record have been used to carry the grooves. Occasionally, records were issued in the 1920s with a recording on only one side. In the eighties Columbia records briefly issued a series of one-sided 45 rpm singles as "loss leaders", the theory being that they could charge less for a one-sided single when not obligated to pay the artist royalties for two.
The majority of non78 rpm records are pressed on black vinyl. The colouring material used to blacken the transparent PVC plastic mix is carbon black. Carbon black increases the strength of the disc and renders it opaque. Polystyrene is often used for 7-inch records. Recently (2008), reissue label Classic has announced their future releases would all be on clear vinyl after technicians determined that the carbon black itself has magnetic properties that detrimentally affect proper playback from the cartridge.
Some records are pressed on coloured vinyl or with paper pictures embedded in them ("picture discs"). Certain 45 rpm RCA or RCA Victor "Red Seal" records used red translucent vinyl for extra "Red Seal" effect. During the 1980s there was a trend for releasing singles on coloured vinyl sometimes with large inserts that could be used as posters. This trend has been revived recently with 7-inch singles.
Vinyl record standards for the United States follow the guidelines of the Recording Industry Association of America (RIAA). The inch dimensions are nominal, not precise diameters. The actual dimension of a 12-inch record is 302 mm (11.89 in), for a 10-inch it is 250 mm (9.84 in), and for a 7-inch it is 175 mm (6.89 in).
Records made in other countries are standardized by different organizations, but are very similar in size. The record diameters are typically 300 mm, 250 mm and 175 mm.
There is an area about 6 mm (0.25 in) wide at the outer edge of the disk, called the lead-in where the groove is widely spaced and silent. This section allows the stylus to be dropped at the start of the record groove, without damaging the recorded section of the groove.
Between each track on the recorded section of an LP record, there is usually a short gap of around 1 mm (0.04 in) where the groove is widely spaced. This space is clearly visible, making it easy to find a particular track.
A macro photo of the innermost grooves of a vinyl record. Stored sound in the form of variations in the tracks is clearly visible, as is dust on the record.
Magnified grooves. Dust can be spotted. Red lines mark one millimeter
Towards the label centre, at the end of the groove, there is another wide-pitched section known as the lead-out. At the very end of this section, the groove joins itself to form a complete circle, called the lock groove; when the stylus reaches this point, it circles repeatedly until lifted from the record. On some recordings (for example Sgt. Pepper's Lonely Hearts Club Band by The Beatles and Atom Heart Mother by Pink Floyd), the sound continues on the lock groove, which gives a strange repeating effect. Automatic turntables rely on the position or angular velocity of the arm, as it reaches these more widely spaced grooves, to trigger a mechanism that raises the arm and moves it out of the way of the record.
The catalog number and stamper ID is written or stamped in the space between the groove in the lead-out on the master disc, resulting in visible recessed writing on the final version of a record. Sometimes the cutting engineer might add handwritten comments or their signature, if they are particularly pleased with the quality of the cut. These are generally referred to as "run-out etchings."
When auto-changing turntables were commonplace, records were typically pressed with a raised (or ridged) outer edge and a raised label area. This would allow records to be stacked onto each other, gripping each other without the delicate grooves coming into contact, thus reducing the risk of damage. Auto changing turntables included a mechanism to support a stack of several records above the turntable itself, dropping them one at a time onto the active turntable to be played in order. Many longer sound recordings, such as complete operas, were interleaved across several 10-inch or 12-inch discs for use with auto-changing mechanisms, so that the first disk of a three-disk recording would carry sides 1 and 6 of the program, while the second disk would carry sides 2 and 5, and the third, sides 3 and 4, allowing sides 1, 2, and 3 to be played automatically; then the whole stack reversed to play sides 4, 5, and 6.
The sound quality and durability of vinyl records is highly dependent on the quality of the vinyl. During the early 1970s, as a cost-cutting move towards use of lightweight, flexible vinyl pressings, much of the industry adopted a technique of reducing the thickness and quality of vinyl used in mass-market manufacturing, marketed by RCA Victor as the "Dynaflex" (125 g) process, considered inferior by most record collectors. Most vinyl records are pressed from a mix of seventy per cent virgin vinyl and thirty per cent recycled vinyl.
New "virgin" or "heavy/heavyweight" (180220 g) vinyl is commonly used for modern "audiophile" vinyl releases in all genres. Many collectors prefer to have 180 g vinyl albums, and they have been reported to have a better sound than normal vinyl. These albums tend to withstand the deformation caused by normal play better than regular vinyl 180 g vinyl is more expensive to produce only because it uses more vinyl. Manufacturing processes are identical regardless of weight. In fact, pressing lightweight records requires more care. An exception is the propensity of 200 g pressings being slightly more prone to "non-fill", where the vinyl biscuit does not sufficiently fill a deep groove during pressing (percussion or vocal amplitude changes are the usual locations of these artifacts). This flaw exhibits a grinding or scratching sound at the non-fill point.
Since most vinyl records contain up to thirty per cent recycled vinyl, impurities can be accumulated in the record, causing a brand new album to have audio artifacts like clicks and pops. Virgin vinyl means that the album is not from recycled plastic, and will theoretically be devoid of these impurities. In practice, this depends on the manufacturer's quality control.
The orange peel effect on vinyl records is caused by worn molds. Rather than having the proper mirror-like finish, the surface of the record will have what looks like an orange peel texture. This introduces noise into the record, particularly in the lower frequency range. It should be noted that with direct metal mastering (DMM) the master disc is cut on a copper-coated disc which can also have a minor "orange peel" effect on the disc itself. As this "orange peel" originates in the master rather than being introduced in the pressing stage, there is no ill-effect as there is no physical distortion of the groove.
While all vinyl records are pressed from metal discs known as 'stampers', a technique known as lathe-cutting is used to cr...
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