Acetate Disc
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An acetate disc (also known as a ''lacquer'', ''test acetate'', ''
dubplate A dubplate is an acetate disc usually of 10 inches diameter, traditionally used by Recording studio, studios to test recordings prior to Audio mastering, mastering for the subsequent pressing of a vinyl record, but pioneered by reggae Reggae sound ...
'', or ''
transcription disc Electrical transcriptions are special phonograph recordings made exclusively for radio broadcasting,Browne, Ray B. and Browne, Pat, Eds. (2001). ''The Guide to United States Popular Culture''. The University of Wisconsin Press. . P. 263. which wer ...
'') is a type of
phonograph record A phonograph record (also known as a gramophone record, especially in British English), or simply a record, is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove. The groove usually starts nea ...
generally used from the 1930s to the late 1950s for recording and broadcast purposes and still in limited use today. Acetate discs are used for the production of records. Unlike ordinary vinyl records, which are quickly formed from lumps of plastic by a mass-production molding process, an acetate disc is created by using a recording lathe to cut an audio-signal-modulated groove into the surface of a lacquer-coated blank disc, a sequential operation requiring expensive, delicate equipment and expert skill for good results. The disc is then coated in metal, which is then peeled off to form a negative that will later be electroplated and peeled to create a mother (positive copy) which is then again electroplated and peeled to create negatives called stampers, which are then used as molds in a
record press A record press is a machine for manufacturing vinyl records. It is essentially a hydraulic press fitted with thin nickel stampers which are negative impressions of a master disc. Labels and a pre-heated vinyl patty (or "biscuit") are placed in ...
. In addition to their use in the creation of masters, they were widely used for many purposes before magnetic tape recorders became common, and in the modern era they are used by dance music DJs. They were used in
radio broadcasting Radio broadcasting is transmission of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio ...
to archive live broadcasts, pre-record local programming, delay network feeds for broadcast at a later time, and provide programming "from home" on the
Armed Forces Radio Network The American Forces Network (AFN) is a government television and radio broadcast service the U.S. military provides to those stationed or assigned overseas. Headquartered at Fort George G. Meade, Maryland, AFN's broadcast operations, which i ...
. They were used extensively in Jamaica by sound system operators in the late 1940s and 1950s. Acetates were often used as "demos" of new recordings by artists and record labels. Some acetates are highly prized for their rarity, especially when they contain unpublished material.


Physical characteristics

Despite their name, professional grade "acetate" discs do not contain any acetate. They consist of an
aluminum disc In the field of audio recording, an aluminum disc (aluminium in the UK and elsewhere) is a phonograph (gramophone in the UK) record made of bare aluminum, a medium introduced in the late 1920s for making one-off recordings. Although sometimes used f ...
with a coating of
nitrocellulose lacquer Lacquer is a type of hard and usually shiny coating or finish applied to materials such as wood or metal. It is most often made from resin extracted from trees and waxes and has been in use since antiquity. Asian lacquerware, which may be ca ...
. Glass was often used for the substrate during World War II, when aluminium was in short supply.''Documenting Early Radio: A Review of Existing Pre-1932 Radio Recordings''
,
Elizabeth McLeod Elizabeth McLeod (born 1963) is a journalist and broadcast historian who lives and works on the coast of Maine. She is best known for her extensive research into the origin and history of ''Amos 'n' Andy'', an authoritative study first available o ...
, 1988-9
The production process results in a disc that is different in several ways from the vinyl records sold to customers at retail. Most noticeably, vinyl records are comparatively lightweight and flexible, while acetates are usually rigid and considerably heavier because of their metal cores. Acetates commonly come in two sizes: discs for singles and discs for albums. The record's sleeve is typically nothing more than a generic cover from the manufacturing company and the disc's label is similarly plain, containing only basic information about the content (title, artist, playing time, and so on), which is usually typed but may be hand-written. Although once produced in a wide range of sizes (from less than to more than in diameter) and sometimes with glass core discs, the examples most commonly encountered today are in diameter and consist of an aluminium core disc coated with black
nitrocellulose lacquer Lacquer is a type of hard and usually shiny coating or finish applied to materials such as wood or metal. It is most often made from resin extracted from trees and waxes and has been in use since antiquity. Asian lacquerware, which may be ca ...
, commonly but incorrectly called " acetate". Instantaneous disc history authority Michael Biel attributes the longstanding "acetate" misnomer to some early lacquer disc labels that carried the warning, "Use only acetate needles", meaning the same high grade of individually inspected steel needles required to safely play the easily needle-damaged ''pressed'' flexible acetate
transcription disc Electrical transcriptions are special phonograph recordings made exclusively for radio broadcasting,Browne, Ray B. and Browne, Pat, Eds. (2001). ''The Guide to United States Popular Culture''. The University of Wisconsin Press. . P. 263. which wer ...
s that were sometimes used in US broadcasting in the 1930s. Blank discs were traditionally produced in several different grades, with the best and costliest grade featuring the sturdiest core, the thickest coating and the most perfectly flawless mirror-like surfaces. These top-quality blanks were intended for cutting the master discs that, once silver-coated, would be electrodeposited with nickel in order to electroform parts used in making stampers (negative profile metal moulds) for pressing ordinary records. Lower-quality blanks were considered adequate for non-critical uses such as tests and demo discs. Lower-grade blanks were formerly made for home use by amateurs and may be very thin and flexible, may have a cardboard rather than a metal or glass base, and may have noticeably dull or slightly orange-peel-textured surfaces. In addition to the usual central ''spindle hole'', there is traditionally at least one ''drive hole'' in the label area, meant to be engaged by a special pin that prevents the disc from slipping on the turntable during the recording process if the lathe does not have a vacuum turntable. Drive holes are often hidden by labels applied after the recording was cut, but they can usually be detected by careful inspection of the label or by holding the disc up to a light bright enough to penetrate the labels. Drive holes are no longer standard on lacquer masters, only on "dubs", because the additional holes can interfere with the electroforming process and professional mastering lathes use vacuum turntables that hold the workpiece (lacquer disc) in place with suction. One pump usually provides suction for both the turntable and the chip tube that pulls away the fine string of nitrocellulose lacquer removed by the groove-cutting stylus. Acetate discs are made for special purposes, almost never for sale to the general public. They can be played on any normal record player but will suffer from wear more quickly than vinyl, since the lacquer does not have the same properties as that of vinyl.


Production

Acetates are usually made by dubbing from a
master recording Mastering, a form of audio post production, is the process of preparing and transferring recorded audio from a source containing the final mix to a data storage device (the master), the source from which all copies will be produced (via met ...
in another medium, such as
magnetic tape Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magne ...
. In the vinyl record manufacturing process, an acetate master disc is cut and
electroforming Electroforming is a metal forming process in which parts are fabricated through electrodeposition on a model, known in the industry as a mandrel. Conductive (metallic) mandrels are treated to create a mechanical parting layer, or are chemically p ...
is used to make negative metal molds from it; each mold, known as a stamper, can be used to
press Press may refer to: Media * Print media or news media, commonly called "the press" * Printing press, commonly called "the press" * Press (newspaper), a list of newspapers * Press TV, an Iranian television network People * Press (surname), a fam ...
thousands of vinyl copies of the master. Within the vinyl record industry, acetates are also used for evaluating the quality of the tape-to-disc transfer. They were once a favored medium for comparing different takes or mixes of a recording, and if pressed vinyl copies of an impending new release were not yet available, acetates were used for getting preview copies into the hands of important radio disc jockeys. Acetates were produced in very small quantities using elementary cutting machines. The majority of discs found on the market were not labelled or marked, as distributing studios would only at most have their name and address written on the disc. It was generally up to the recipients to scribble the song title or name of the artist onto the disc by hand. On February 6, 2020, news broke of a fire at the Apollo Masters manufacturing plant in Banning, California. The plant produces Acetate (Lacquer) discs used in vinyl production with the fire completely destroying the manufacturing facility. The manufacturing facility is one of only two in the world, the other being MDC based in
Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...
. This led to industry experts fearing that the
vinyl Vinyl may refer to: Chemistry * Polyvinyl chloride (PVC), a particular vinyl polymer * Vinyl cation, a type of carbocation * Vinyl group, a broad class of organic molecules in chemistry * Vinyl polymer, a group of polymers derived from vinyl m ...
production supply chain would be put under stress with heavy demand and only one factory worldwide.


Uses

Acetates have not always been used solely as a means of evaluating a tape-to-disc transfer or cutting the final master disc. They were used for many purposes before magnetic tape recorders became common, and in the modern era they are used by dance music DJs. They were used extensively in Jamaica by sound system operators in the late 1940s and 1950s. Acetates were often used as "demos" of new recordings by artists and record labels.


Disc mastering

In preparation for a record pressing, acetates are used for quality control prior to the production of the stampers, from which retail copies of the record will be pressed. The purpose of the test acetate(s) (called, 'reference disks') in the mastering process is to allow the artist, producer, engineer, and other interested parties to check the quality of the tape-to-disc recording process and make any necessary changes to ensure that the audio fidelity of the master disc will be as close as possible to that of the original master tape. The actual stamper sets can be made either from oversized lacquers or from DMM blanks (see Direct Metal Mastering).


Direct recording

upPresto 8N Acetate disc engraver (1950) used by the Canadian Broadcasting Corporation to record radio programs Before the introduction of
magnetic tape Magnetic tape is a medium for magnetic storage made of a thin, magnetizable coating on a long, narrow strip of plastic film. It was developed in Germany in 1928, based on the earlier magnetic wire recording from Denmark. Devices that use magne ...
for mastering, disc recording was done "live" (see
direct to disc recording Direct-to-disc recording refers to sound recording methods that bypass the use of magnetic tape recording and record audio directly onto analog disc masters. Professional analog sound recording Most sound recordings for records before the 1950s ...
), although sometimes intermediate disc-to-disc editing procedures were involved. Before acetate discs were adopted for the purpose, the master recording was cut into a disc of wax-like material that was too soft to be played non-destructively and had to be electroplated to produce a metal stamper, which was in turn used to make playable pressings. Acetate blanks allowed high-quality playable records to be produced "instantaneously". Acetates were used in
radio broadcasting Radio broadcasting is transmission of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience. In terrestrial radio broadcasting the radio waves are broadcast by a land-based radio ...
to archive live broadcasts, pre-record local programming, delay network feeds for broadcast at a later time, and provide programming "from home" on the
Armed Forces Radio Network The American Forces Network (AFN) is a government television and radio broadcast service the U.S. military provides to those stationed or assigned overseas. Headquartered at Fort George G. Meade, Maryland, AFN's broadcast operations, which i ...
. (In many cases, the AFRN disc is the only form in which a classic radio show has survived.) discs recorded at  rpm were used for these one-off "
electrical transcriptions Electrical transcriptions are special phonograph recordings made exclusively for radio broadcasting,Browne, Ray B. and Browne, Pat, Eds. (2001). ''The Guide to United States Popular Culture''. The University of Wisconsin Press. . P. 263. which wer ...
" beginning in the mid-1930s. Disc recorders designed for amateur home use began appearing on the market around 1940, but their high prices limited sales, and then
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
brought their production to a halt. After the war, the popularity of such recorders greatly increased. It was not unusual for a
carnival Carnival is a Catholic Christian festive season that occurs before the liturgical season of Lent. The main events typically occur during February or early March, during the period historically known as Shrovetide (or Pre-Lent). Carnival typi ...
,
circus A circus is a company of performers who put on diverse entertainment shows that may include clowns, acrobats, trained animals, trapeze acts, musicians, dancers, hoopers, tightrope walkers, jugglers, magicians, ventriloquists, and unicyclist ...
,
amusement park An amusement park is a park that features various attractions, such as rides and games, as well as other events for entertainment purposes. A theme park is a type of amusement park that bases its structures and attractions around a central ...
, or
transit hub A transport hub is a place where passengers and cargo are exchanged between vehicles and/or between transport modes. Public transport hubs include railway stations, rapid transit stations, bus stops, tram stops, airports and ferry slips ...
to offer disc recording in a booth for a modest fee. Countless discs were cut at parties and family gatherings, both for immediate amusement value and to preserve audio "snapshots" of these events and of the voices of relatives and friends. Schoolchildren and adults alike used them to practice speeches, amateur musical efforts were immortalized, and snippets of radio broadcasts were captured, all limited by the three- or four-minute maximum playing time of the 78 rpm large-groove format which was still standard for all home-use records. The home recorders typically had two tone arms, one for recording and the other for playback, and a red light to indicate recording was taking place. One problem with the process was the "string" of aluminum that followed the recording tone arm as the groove was cut. This "string" could interfere with the recording process and required manual intervention to remove. This relatively bulky equipment, and the bulky discs, were hauled to remote locations such as
Yugoslavia Yugoslavia (; sh-Latn-Cyrl, separator=" / ", Jugoslavija, Југославија ; sl, Jugoslavija ; mk, Југославија ;; rup, Iugoslavia; hu, Jugoszlávia; rue, label=Pannonian Rusyn, Югославия, translit=Juhoslavija ...
(see
Milman Parry Milman Parry (June 23, 1902 – December 3, 1935) was an American Classicist whose theories on the origin of Homer's works have revolutionized Homeric studies to such a fundamental degree that he has been described as the " Darwin of Homeric ...
) or the
Mississippi Delta The Mississippi Delta, also known as the Yazoo–Mississippi Delta, or simply the Delta, is the distinctive northwest section of the U.S. state of Mississippi (and portions of Arkansas and Louisiana) that lies between the Mississippi and Yazoo ...
(see
Archive of American Folk Song The Archive of Folk Culture (originally named The Archive of American Folk Song) was established in 1928 as the first national collection of American folk music in the United States of America. It was initially part of the Music Division of the Libr ...
) by
ethnographer Ethnography (from Greek ''ethnos'' "folk, people, nation" and ''grapho'' "I write") is a branch of anthropology and the systematic study of individual cultures. Ethnography explores cultural phenomena from the point of view of the subject o ...
s,
linguist Linguistics is the scientific study of human language. It is called a scientific study because it entails a comprehensive, systematic, objective, and precise analysis of all aspects of language, particularly its nature and structure. Linguis ...
s, and musical researchers. Substantial collections of these recordings are available to researchers at academic and national libraries, as well as
museum A museum ( ; plural museums or, rarely, musea) is a building or institution that cares for and displays a collection of artifacts and other objects of artistic, cultural, historical, or scientific importance. Many public museums make these ...
s. During the very early tape era, around 1950, acetate discs and portable disc recorders competed with magnetic tape as a location-recording medium, both for broadcast and semi-pro use, but tape's several advantages quickly won the contest. Recording services hired to record weddings and other private events routinely captured them on tape, but because most homes of the 1950s and early 1960s were not equipped to play tapes, while nearly everyone had a record player, typically the recording was dubbed to disc and supplied to the client in that form and the original tape was recycled. Acetate discs are inherently less durable than some types of magnetic tape, and have the disadvantage of not being physically editable; unlike tape, acetates cannot be cut and spliced.


Black and dance music

In the
dance music Dance music is music composed specifically to facilitate or accompany dancing. It can be either a whole musical piece or part of a larger musical arrangement. In terms of performance, the major categories are live dance music and recorded danc ...
world, DJs cut new or otherwise special tracks on acetates, in order to test crowd response and find potential hits. This practice started as early as in the 1960s in Jamaica, between soundsystems, as a way of competing and drawing bigger crowds. These discs are known as
dubplates A dubplate is an acetate disc usually of 10 inches diameter, traditionally used by studios to test recordings prior to mastering for the subsequent pressing of a vinyl record, but pioneered by reggae sound systems as a way to play exclusive music ...
. Dubplates were used by reggae soundsystems worldwide, and later adopted by producers of various dance music genres, most notably drum and bass and
dubstep Dubstep is a genre of electronic dance music that originated in South London in the early 2000s. The style emerged as a UK garage offshoot that blended 2-step rhythms and sparse dub production, as well as incorporating elements of broken be ...
. Trading dubplates between different DJs is an important part of DJ culture. Actual acetate dubplates are declining in popularity, and being increasingly replaced by CDs and
vinyl emulation software A close-up of a time-coded vinyl record Vinyl emulation allows a user to physically manipulate the playback of digital audio files on a computer using the turntables as an interface, thus preserving the hands-on control and feel of DJing with vi ...
for reasons of weight, durability and overall cost.


Value

Due to their rarity, some acetates can command high prices at auction.
Brian Epstein Brian Samuel Epstein (; 19 September 1934 – 27 August 1967) was a British music entrepreneur who managed the Beatles from 1962 until his death in 1967. Epstein was born into a family of successful retailers in Liverpool, who put him i ...
's collection of
Beatles The Beatles were an English rock band, formed in Liverpool in 1960, that comprised John Lennon, Paul McCartney, George Harrison and Ringo Starr. They are regarded as the most influential band of all time and were integral to the developme ...
acetates fetched between $1,000 and $10,000 per disc, a rare one even reached £77,500 at auction. An acetate from
The Velvet Underground The Velvet Underground was an American rock band formed in New York City in 1964. The original line-up consisted of singer/guitarist Lou Reed, multi-instrumentalist John Cale, guitarist Sterling Morrison, and drummer Angus MacLise. MacLise ...
, containing music that would later appear on their first album ''
The Velvet Underground & Nico ''The Velvet Underground & Nico'' is the debut album by the American rock band the Velvet Underground and German singer Nico, released in March 1967 through Verve Records. It was recorded in 1966 while the band were featured on Andy Warhol's Ex ...
'', sold on
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in 2006 for $25,200. An acetate of Elvis Presley's "
That's All Right "That's All Right" is a song written and originally performed by blues singer Arthur Crudup and recorded in 1946. The song was rereleased in early March 1949 under the title "That's All Right, Mama", which was issued as RCA's first rhythm and bl ...
" sold for $82,393.60 in 2013. The only known copy of Presley's first recording—a 78 rpm acetate from 1953 featuring " My Happiness" backed with " That's When Your Heartaches Begin"—sold for $300,000 at a
Graceland Graceland is a mansion on a estate in Memphis, Tennessee, United States, which was once owned by rock and roll icon Elvis Presley. His daughter, Lisa Marie Presley, inherited Graceland after his death in 1977. Graceland is located at 3764 Elv ...
auction.


See also

* Direct metal mastering


References

{{reflist Audio storage