A phonograph, later called a gramophone, and since the 1940s a record player, or more recently a turntable, is a device for the mechanical and analogue reproduction of recorded sound. The sound vibration waveforms are recorded as corresponding physical deviations of a spiral groove engraved, etched, incised, or impressed into the surface of a rotating cylinder or disc, called a "record". To recreate the sound, the surface is similarly rotated while a playback stylus traces the groove and is therefore vibrated by it, faintly reproducing the recorded sound. In early acoustic phonographs, the stylus vibrated a diaphragm that produced sound waves coupled to the open air through a flaring horn, or directly to the listener's ears through stethoscope-type earphones.
A cam is a rotating or sliding piece in a mechanical linkage used especially in transforming rotary motion into linear motion. It is often a part of a rotating wheel or shaft that strikes a lever at one or more points on its circular path. The cam can be a simple tooth, as is used to deliver pulses of power to a steam hammer, for example, or an eccentric disc or other shape that produces a smooth reciprocating motion in the follower, which is a lever making contact with the cam. A cam timer is similar, and were widely used for electric machine control before the advent of inexpensive electronics, microcontrollers, integrated circuits, programmable logic controllers and digital control.
A laser turntable is a phonograph that plays standard LP records using laser beams as the pickup instead of using a stylus as in conventional turntables. Although these turntables use laser pickups, the same as Compact Disc players, the signal remains in the analog realm and is never digitized.
A magnetic cartridge, more commonly called a phonograph cartridge or phono cartridge or (colloquially) a pickup, is an electromechanical transducer that is used to play phonograph records on a turntable.
Technics SL-1200 is a series of direct-drive turntables originally manufactured from October 1972 until 2010, and resumed in 2016, by Matsushita Electric under the brand name of Technics. S means "Stereo", L means "Player". Originally released as a high fidelity consumer record player, it quickly became adopted among radio and disco club disc jockeys, thanks to the direct drive, high torque motor design, making it initially suitable for pushbutton cueing and starting of tracks on radio and in dance clubs. Beside these features it had a so called pitchcontrol, which allowed the user to change the turning speed of the record gradually from -8% to +8%. This feature was specifically interesting for DJ's who were mixing two or more records with each other, especially in dance clubs. The turntable is still extremely popular with audiophiles.
The Capacitance Electronic Disc (CED) is an analog video disc playback system developed by Radio Corporation of America (RCA), in which video and audio could be played back on a TV set using a special stylus and high-density groove system similar to phonograph records.
The overwhelming majority of records manufactured have been of certain sizes, playback speeds, and appearance. However, since the commercial adoption of the gramophone record, a wide variety of records have also been produced that do not fall into these categories, and they have served a variety of purposes.
A record changer or autochanger is a device that plays several phonograph records in sequence without user intervention. Record changers first appeared in the late 1920s, and were common until the 1980s.
Stereophonic sound, or more commonly stereo, is a method of sound reproduction that recreates a multi-directional, 3-dimensional audible perspective. This is usually achieved by using two independent audio channels through a configuration of two loudspeakers in such a way as to create the impression of sound heard from various directions, as in natural hearing.
Elektromesstechnik (EMT) is a manufacturer of phonograph turntables and professional audio equipment, including a well-regarded line of artificial reverberation devices beginning with the EMT 140 plate reverb. The company was founded by Wilhelm Franz.
Record restoration, a particular kind of audio restoration, is the process of converting the analog signal stored on gramophone records into digital audio files that can then be edited with computer software and eventually stored on a hard-drive, recorded to digital tape, or burned to a CD or DVD. The process may be divided into several separate steps performed in the following order:
- Cleaning the record, to prevent unwanted audio artifacts from being introduced in the capture that will necessitate correction in the digital domain, and to prevent unnecessary wear and damage to the stylus used in playback.
- Transcription of the record to another format on another medium ;
- Processing the raw sound file with software in order to remove transient noise resulting from record surface damage ;
- Using software to adjust the volume and equalization;
- Processing the audio with digital and analogue techniques to reduce surface/wideband noise;
- Saving the file in the desired format.
Cook Records was a record label founded by Emory Cook (1913–2002), an audio engineer and inventor. From 1952 to 1966, Cook used his Sounds of our Times and Cook Laboratories record labels to demonstrate his philosophy about sound, recording equipment, and manufacturing techniques.
The conservation and restoration of vinyl discs refers to the preventive measures taken to defend against damage and slow degradation, and to maintain fidelity of singles, 12" singles, EP’s, and LP’s in 45 or 33⅓ rpm 10" disc recordings.
In the field of audio recording, an aluminum disc is a phonograph record made of bare aluminum, a medium introduced in the late 1920s for making one-off recordings. Although sometimes used for making amateur studio or home recordings or in coin-operated "record-your-voice" booths at fairs and arcades, during the first half of the 1930s bare aluminum discs were primarily used to record radio broadcasts for the private transcription disc archives of performers or sponsors.
The Technics SL-10 is a direct-drive, linear tracking automatic turntable, which was produced from 1979 to 1985.
The Volta Laboratory and the Volta Bureau were created in Georgetown, Washington, D.C., by Alexander Graham Bell.
The Numark Pro TT-2, Pro TT-1+, Pro TT-1 and TT-100 were a family of private label, high end, direct drive DJ phonograph turntables sold by Numark during the late 1990s and early 2000s. Only in production for a few years, these models were among the early versions of the "Super OEM" manual DJ turntables made by the Hanpin Electron Co., Ltd. of Taiwan. The Pro TT-1, Pro TT-1+, and Pro TT-2 models incorporated a LCD display on the top plate to show turntable settings which included a unique 12 segment animated element to indicate platter rotation and direction.
The Roksan Xerxes transcription turntable is a record player named after the Persian king Xerxes I and produced by London-based Roksan Audio. Designed by Roksan co-founder, Touraj Moghaddam, the Xerxes is a belt-driven turntable with a solid plinth. Launched in 1985, the sound quality of the product positioned it as a strong competitor against the established industry leader, the Linn Sondek LP12. Many reviewers use the Xerxes as a reference turntable.
The Rega Planar 3, together with its successors, the P3 and RP3, is a well-known budget audiophile turntable by British hi-fi manufacturer, Rega Research available since 1977. It was a belt-drive deck that broke from convention, by employing a solid plinth in lieu of the compliantly suspended chassis or sub-chassis used in many quality turntables since the early 1960s.
The Technics SL-J2 is a quartz-controlled direct-drive fully automatic turntable system produced by Technics between 1984 and 1988. It features a linear tracking tonearm with an optical sensor that allows for the kind of track-skipping more typical of CD players. The sensor also detects the size of the record sitting on the platter, which allows the needle to drop precisely on the first track.
