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| − | __NOTOC__
| + | Das [[Dual C 939]] Cassetten-Deck ist eine Weiterentwicklung des [[C 919]], es wurden die VU-Meter durch LED-Ketten ersetzt. Dieses Gerät hatte Dolby-B und Dolby-FM Schaltungen. Letztere wurde bei UKW/FM Radiosendungen eingesetzt um Rauschen zu unterdrücken und um die Höhen wieder aus zu tolerieren wenn zur Aufnahme dann die Dolby-B Rauchunterdrückung zum Einsatz kam. |
| − | == Data ==
| + | Durch eine Optokopler-Steuerung wobei stroboskopartige Blitze im Normalfall den korrekten Bandlauf signalisierten, kam bei einer Störung oder Bandende diese zum Stehen oder verlangsamte sich wurde der STOP-Vorgang veranlaßt, durch Anziehen eines Magnets was dann die mechanischen Tasten auslöste. |
| − | {{navigation}}
| + | Eine sogenannte ''Fade-Edit'' Schaltung war auch eingebaut, mit welcher man dann nachträglich gezielte Ausblendungen am Bandende machen konnte, um das abrupte Abbrechen der Musik abzurunden - sogar mit Hinterbandkontrolle! Dazu wurde der Löschkopf über einen Dreh-Regler welcher die Signalstärke der Vormagnetisierungsfrequenz regelte verwendet um das Band variable zu löschen. Den Erfolg konnte man dann sofort über den Tonkopf abhören! |
| − | '''General'''
| + | Ein weiteres Merkmal des [[C 939]] war die Autoreverse-Einrichtuung. |
| − | * Manufacturer: [[Dual]]
| + | Mit einem kleinen Trick konnte man sogar die Maschine in eine Dauer-Aufnahmemaschine verwandeln, wozu dann der Abschaltmechanismus am Bandende wiederum nur die Bandlaufrichtung umgeschaltet hat und eben wiederum das Band überspielt wurde - und eben dann die letzten Minuten - je nach maximaler Bandlänge gespeichert waren. |
| − | * Model: C 939
| + | An der rechten Gerätehälfte war ein eingebautes Mischpult für zwei Mikrofone (2x Stereo, oder 1x Mono, mit automatischer Umschaltung) und einen Audio-Eingang. |
| − | * Type: Cassette deck
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| − | * Years of manufacture: 1977 - 1979
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| − | * Made in: Germany
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| − | * Colours: Silver, Brown, Black
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| − | * Remote control: no
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| − | * Power consumption: approx. 35 watts
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| − | * Dimensions: 440 x 105 x 300 mm (WxHxD)
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| − | * Weight: 7 kg
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| − | * Original price approx.: 1'050 DM
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| − | '''Connections'''
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| − | * Number of inputs: 3
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| − | ** Microphone (2 jack sockets) 0,3mV/10kOhm
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| − | ** Line in (DIN socket) 0.45mV/4.7kOhm
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| − | ** Line in (RCA jacks) 70mV/82kOhm
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| − | * Number of outputs: 3
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| − | ** Line out (DIN socket) 0-700mV/1.8kOhm
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| − | Line out (Cinch sockets) 0-700mV/1,8kOhm
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| − | ** Headphones (jack socket) 4-2000Ohm
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| − | '''Technical data'''
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| − | * Audio heads: 3
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| − | * motors: 1
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| − | * Synchronous oscillations:
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| − | * Band types: CrO2, FeCr, Normal.
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| − | * Frequency response: Normal band 20-14000Hz, CrO2 band 20-16000Hz, FeCr band 20-17000Hz
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| − | * Distortion factor: 1,0-1,8 % (330Hz, 0db)
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| − | * Auto-Reverse: yes
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| − | * Title search: no
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| − | * Dolby: B, FM
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| − | * MPX filter: no
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| − | * Fader: no
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| − | * Pitch control: no
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| − | * CD synchro recording: no
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| − | '''Special Features'''
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| − | * Headphone output, adjustable
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| − | * Microphone input, mono/stereo
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| − | * Continous Play
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| − | * Fade edit (subsequent deletion of passages during playback)
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| − | * Tape counter with memory function
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| − | * Limiter for recording level
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| − | == Remarks ==
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| − | * Other models in the same series:
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| − | * Integrated amplifier:
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| − | * [[Dual CV 31]]
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| − | * [[Dual CV 62]]
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| − | * [[Dual CV 121-1]]
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| − | * [[Dual CV 240]]
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| − | * [[Tuner:
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| − | * [[Dual CT 19]]
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| − | * [[Dual CT 125]]
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| − | * Receiver:
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| − | * [[Dual CR 120]]
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| − | * [[Dual CR 220]]
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| − | * [[Dual CR 230]]
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| − | | |
| − | * [[Tape Deck]]
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| − | * [[Dual C 819]]
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| − | * [[Dual C 919]]
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| − | * [[Dual C 919-1]] Model without autoreverse, without fade edit, with VU pointer instruments instead of LED chains.
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| − | * [[Dual C 939]]
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| − | * Turntables:
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| − | * [[Dual CS 502]]
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| − | * [[Dual CS 510]]
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| − | * [[Dual CS 604]]
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| − | * [[Dual CS 621]]
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| − | * [[Dual CS 704]]
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| − | * [[Dual CS 721]]
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| − | * [[Dual CS 1225-1]]
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| − | * [[Dual CS 1249]]
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| − | * [[Loudspeaker:
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| − | * [[Dual CL 230]]
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| − | * [[Dual CL 240]]
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| − | * [[Dual CL 250]]
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| − | * [[Dual CL 260]]
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| − | * [[Dual CL 270]]
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| − | * [[Dual CL 370]]
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| − | * [[Dual CL 380]]
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| − | * [[Dual CL 390]]
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| − | == Pictures ==
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| − | * Image: Dual C 939
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| − | [[bild:Dual_C939.JPG]]
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| − | * Excerpt from brochure: Dual C 939
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| − | [[File:Dual C-939-Prospekt-1979.jpg]]
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| − | == Reports ==
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| − | * Test in "Hifi-Stereophonie" 9 / 1977
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| − | * The [[Dual C 939]] Cassette deck is a further development of the [[Dual C 919]], it replaced the VU meters by LED chains.
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| − | * This unit had Dolby-B and Dolby-FM circuits. The latter was used with FM/FM radio broadcasts to suppress noise and to tolerate the treble back out when for recording then the Dolby-B noise reduction was used.
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| − | By an Optokopler control whereby stroboscope-like flashes in the normal case the correct tape run signaled, came with a disturbance or tape end this to the stop or slowed down the STOP procedure was caused, by attracting a magnet which then the mechanical keys released.
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| − | A so-called ''Fade-Edit'' circuit was also built in, with which one could then make targeted fade-outs at the end of the tape to round off the abrupt termination of the music - even with rear tape control! For this purpose, the erase head was used to variably erase the tape via a rotary controller that regulated the signal strength of the premagnetization frequency. The success could then be heard immediately via the audio head!
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| − | * Another feature of the Dual C 939 was the autoreverse facility.
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| − | With a little trick, you could even turn the machine into a continuous recording machine, for which the switch-off mechanism at the end of the tape again only switched the tape running direction and just again the tape was over-recorded - and just then the last minutes - depending on the maximum tape length were stored.
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| − | * On the right half of the device was a built-in mixer for two microphones (2x stereo, or 1x mono, with automatic switching) and an audio input.
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| − | This tape deck was undoubtedly one of the better ones from the late seventies and early eighties, especially since it was - after it was taken out of the manufacturer's program - sold off as a remaining stock at practically half the price. Better tape decks from the Far East were SIGNIFICANTLY more expensive at that time, but top-loaders were just out of fashion...
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| − | Today, the C939 has only nostalgic value, because there are many decks on the second-hand market with much better sound and technology.
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| − | == Links ==
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| − | * More pictures and information about this unit: http://bandmaschinen.jimdo.com
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| − | [[Category:Cassette Decks]]
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