Revox A 77 specifications

Category : Tape machines

Brand : Revox

General

connectors

Tech nical data

special features

• manufacturer: Revox
• model: A 77 Mk I, MK II, MK III, and Mk IV
• year of construction: 1967-1981
• Made in: Germany / Switzerland
• color: gray, silver, Case walnut
• remote control: wired remote control 5 m or 10 m (accessory)
• power consumption: 70 W / Power amplifiers max. 100 W
• Dimensions, horizontal): 413 mm × 359 mm × 215 mm (W × H × D)
• Weight: approx. 15 kg
• Factory price approx.: 1700 DM (list price)

• Number of outputs: 3
  • 2 × Output (RCA): 2.5 V / Ri 600 Ω
  • 1 × Radio (DIN): 1.2V / Ri 2.5 kΩ
  • 1 × Phones (jack 6.3mm): 200-600 Ω

• Number of inputs: 3
  • 2 × MIC (jack 6.3mm / RCA) Low: 0.15mV / 50-600 kΩ / High: 2.5mV / up to 100 kΩ
  • 2 × Aux (RCA): 35 mV at 1 MΩ
  • 1× Radio (DIN): 2.5mV at 33 kΩ

• 2 × MIC (jack 6.3mm / RCA) Low: 0.15 mV / 50-600 kΩ / High: 2.5mV / up to 100 kΩ
• 2 × Aux (RCA): 35 mV at 1 MΩ
• 1× Radio ( DIN): 2.5 mV at 33 kΩ

• Max. Coil diameter: 26.5 cm (10,5")
• drive: 3 external rotor AC motors (direct drive)
  • variable speed via a highly stable oscillator, and a tachometer generator regulated
  • 2 asynchronous winding engines
• heads: 3
• tracks: 2 or 4, depending on the design,
• belt speeds: 9.5 and 19, or 19 and 38 cm/s, depending on the version, ±0,2 %
• slip: <0,2 %
• flutter:
• Pitch changes:
  • at 38 cm/s <±0,06 %
  • at 19 cm/s <±0,08 %
  • at 9.5 cm/s <±0,1 %

• variable speed via a highly stable oscillator, and a tachometer generator regulated
• 2 asynchronous winding engines

• at 38 cm/s <±0,06 %
• at 19 cm/s <±0,08 %
• at 9.5 cm/s <±0,1 %

• total frequency response:
  • at 38 cm/s : 30-22.000 Hz +2/-3 dB or 50-18.000 Hz ±1.5 dB
  • at 19 cm/s : 30-20.000 Hz +2/-3 dB or 50-15.000 Hz ±1.5 dB
  • at 9.5 cm/s: 30-16.000 Hz +2/-3 dB or 50-10.000 Hz ±1.5 dB
• signal-to-noise ratio: (on tape, CCITT , curve C):
  • at 38 cm/s >61 dB
  • at 19 cm/s >61 dB
  • at 9.5 cm/s >58 dB
• external voltage distance: k. A.
• total harmonic distortion: <2 % (0 VU, 19 and 38 cm/s), <3 % (0 VU, 9.5 cm/s),
• equalization: NAB (record + playback) or IEC (play)
• Crosstalk: Mono: >60 dB, Stereo: >45 dB (1 kHz)
• delete attenuation: ≥80 dB
• premagnetization and deletion frequency: 120 kHz

• at 38 cm/s : 30-22.000 Hz +2/-3 dB or 50-18.000 Hz ±1.5 dB
• at 19 cm/s : 30-20.000 Hz +2/-3 dB or 50-15.000 Hz ±1.5 dB
• at 9.5 cm/s: 30-16.000 Hz +2/-3 dB or 50-10.000 Hz ±1.5 dB

• at 38 cm/s >61 dB
• at 19 cm/s >61 dB
• at 9.5 cm/s >58 dB

• in Addition, plug-in power amplifier 2 × 8 W into 8 Ω; (accessories)
• versions with wooden Cabinet, carrying case, and as a built-in chassis
• versions with Dolby-B-NRS , ORF (Studio Version high speed , symm. In/Out)

• Other models of the same series:
• Revox A 700
• Successor Revox B 77

Amplifier:
• Revox A 78

• Excerpt from brochure: Revox A 77

• Excerpt from Brochure: 4309a50722681eb2b52799462e501edb, A 77, A 78

• A77 Dolby, HiFi stereophony 1983-05 (Arndt Klingelnberg)
• A77 Analog coil tape recorder compared to digital recording PCM, HiFi stereophony 1982-12ff (Arndt Klingelnberg)

• (Illustrated) Information about the A77 in the Tape Museum
• Revox A77 service manual
• Tape machines on Revox website

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