The entire drive of the A77 was built on a stable, torsion-free die-cast chassis; For further stability, the tonearm bearing, the tonehead carrier and even the side walls were made of die cast.

New old stock units available from the factory with full warranty. Please inquire as to availability as these are extremely limited and there is a waiting list.

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The well-known reliability of the Revox A77 is a result of a professional design concept which successfully combines the advantages of a solidly constructed tape transport mechanism with the advantages of an advanced electronic circuit design. A 3-motor transport mechanism with electronically regulated capstan motor and solenoid operated servo-brakes possesses few parts which are subject to mechanical wear. The use of a diecast motor chassis and head support ensures that a high degree of mechanical precision and long term stability are maintained, even under excessively heavy use. The mechanical and electronic properties thus complement each other in a most successful way.

Technical Data

Tape Transport Three Studer eddy current motors. Electronically governed capstan motor. Electronic speed change. Solenoid operated via 3 relays.
Tape Speeds 3.75 and 7.5 ips (9,5 cm and 19 cm/sec.) ± 0.2%
High speed Version: 7.5 and 15 ips (19 cm and 38 cm/sec.) ± 0.2%
Wow and Flutter max. ± 0.04% at 15 ips
max. ± 0.08% at 7.5 ips
max. ± 0.1% at 3.75 ips (Weighted at DIN Standard 45507)
Tape Slip Less than 0.2%
Reel Diameter Maximum 10.5″ (26,5cm)
(Minimum hub diameter 23/8 inches)
Forward / Rewind Fast winding time for 1800′ (1100m) is 92 seconds
Tape Heads Three (Separate precision erase, record and playback heads.) Patented ‘True Radius’ design ensures excellent S/N ratio and head wrap
Operating position horizontal or vertical
Monitoring Individual stereo record and playback heads with separate preamps, plus separate record and play circuits permit full source-tape monitoring.
Equalization NAB Standard on both record and playback at all speeds.
IEC Standard switchable on playback only.
Record Playback
Frequency Response:(Based on Revox 601)
15 ips – 30 Hz – 20 kHz ± 1.5 dB
7.5 ips – 30 Hz – 20 kHz + 2 / – 3 dB
3.75 ips – 30 Hz – 16 kHz + 2 / – 3 dB
Signal to noise: 2-Track:
15 ips – better than 66 dB
7.5 ips – better than 66 dB
3.75 ips – better than 63 dB4-Track:
15 ips – better than 62 dB
7.5 ips – better than 62 dB
3.75 ips – better than 59 dBAdd 4 dB to the above figures with Dolby on, referenced to less than 2% THD
(Reference with Scotch 203 or Revox 601 or equivalent. Weighted as per CCITT C-curve to exclude supersonic bias noise.)
Output per channel OUTPUT: max 2.5 rms @ 600 ohms
RADIO: max 1.2 rms @ 2.5 K ohms
PHONES: 200 – 600 ohms (no electrostatic)
Semiconductor complement 54 Transistors; 32 diodes, 4 silicon rectifiers, 1 CdS-cell
Remote control Fully electric for all operation functions.
Output Amplifiers Plug-in optional. 2 x8 watts continuous rms power, 2 x10 watts music power as per IHFM, 4-16 ohms, less than 1% distortion.
Power Supply Electronically stabilized.
Mains voltages 110, 130, 150, 220,240, 250V / 50-60 Hz.
Power consumption 70 to 100 watts
(Wooden Cabinet)
161/4” W x 141/8” H x 81/2” D.
(Measurements include knobs but not reels.)
Weight Approximately 34 pounds (» 15 kg)


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