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The Revox B77 tape recorder was presented at the 1977 audio trade shows together with a completely new hi-fi line.
This included the B750 amplifier and the B760 FM tuner, as well as the B790 record player and the BX series loudspeaker cabinets in the new design.
In addition to the standard version with speeds of 9.5/19 cm/s, the following models were available: B77-HS with 19/38 cm/s (high speed), B77-LS with 4.75/9.5 cm/s (low speed), B77-SLS with 2.38/4.75 cm/s (super low speed for monitoring tasks), B77-AUT0 with automatic recording start as well as three versions with additional pilot head for simple to sophisticated slide projector control. B77 synch tape recorders had a clock track amplifier for professional synchronous recording from the recording head. Finally, the B77-DOL offered separate Dolby TM-B processors for recording and playback (i.e. dolbysed back-band control) for the highest noise voltage ratios (19 cm/s, half track, better than 74 dB).
Main Technical Features
Dimensions
weight (kg): 17
depth (mm): 207
height (mm): 414
width (mm): 452
Drive: Three-motor drive 2 AC coil motors 1 AC sound motor electronically controlled
Noise-to-voltage ratio (according to ASA-A, measured over band): 64 dB, 63 dB, 67 dB, 60 dB
Frequency response over tape: 30 Hz bis 16 kHz + 2 dB bis – 3 dB, 30 Hz bis 20 kHz + 2 dB bis – 3 dB
Tape speed: HS 19,05/38,1 cm/s, NS 9,5/19,05 cm/s, LS 4,75/9,5 cm/s, SLS 2,38/4,75 cm/s
Synchronisation fluctuation: 38 cm/s < 0,06 %, 9.5 cm/s < 0,10 %, 19 cm/s < 0,08 %
power consumption: max. 80 VA
Equipment: 11 ICs, 1 optocoupler, 4 triacs, 60 transistors, 33 diodes, 5 LEDs, 2 bridge rectifiers, 3 relays
Slip: max. 0,2 %
Rewind time: 135 sec. for 1100m tape
Coil size: up to 26.5 cm (10.5 inch)
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