Revox A 700

Data

General

• Manufacturer: Revox
• Model: A 700
• Model series: 700 series
• Years of manufacture: 1973-1982
• Manufactured in: Germany/Switzerland
• Color: gray, aluminum, side panels: Walnut
• Remote control: Option
• Power consumption: 130 W max.
• Dimensions: 490 mm × 470 mm × 210 mm (W × D × H, horizontal)
• Weight: 23,5 kg
• Original price approx.: 3600 DM

Connections

• Number of stereo inputs:
  • 2 × MIC (jack 6.3 mm): 0.15/1.8 mV at 6 kΩ balanced, floating.

1 × phono (cinch): 2.5 mV at 50 kΩ (RIAA)

• • 2 × Aux (Cinch): 40 mV at 100 kΩ
  • 1 × radio (DIN): 3 mV at 33 kΩ.
• Number of stereo outputs:
  • 2 × Aux (Cinch): 1.55 V (6 dB) at 5 kΩ
  • 1 × radio (DIN): 0.775 V (0 dB) at 10 kΩ
  • 2 × headphones (jack 6.3 mm): max. 4.9 V at 100 Ω

Technical Data

• Max. Coil diameter: 26,5 cm (10,5")

Drive: 3 electr. controlled robust AC motors(direct drive)

• Tone motor via clock quartz reference (1.63840 MHz) phase-locked synchronized
  • 2 winding motors
• Heads: 3
• Tracks: 2 or 4, depending on version
• Tape speeds: 9.5, 19 and 38 cm/s, ±0.1 %
• Slip: <0.1 %
• Synchronization fluctuations:
• Pitch fluctuations:
  • at 38 cm/s >±0.06 %.
  • at 19 cm/s >±0.08 %
  • at 9.5 cm/s >±0.1 %

• Overall frequency response:
  • at 38 cm/s : 30-22,000 Hz +2/-3 dB and 50-18,000 Hz ±1.5 dB respectively.

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:
• External voltage spacing:
  • at 38 cm/s >65 dB
  • at 19 cm/s >66 dB
  • at 9.5 cm/s >63 dB

• Distortion factor: <0.6% (0 VU, 19 and 38 cm/s), <1% (0 VU, 9.5 cm/s),
• Equalization: NAB or CCIR
• Crosstalk attenuation: Mono: >60 dB, Stereo: >45 dB (1 kHz)
• Cancellation attenuation: ≥80 dB
• Premagnetization and cancellation frequency: kHz

Special equipment

• Mechanical:
• Indicator light for synchronous state of set speed
• Via FB variable speed (±7 semitones) possible

Electron. Electronic belt tension control with 2 inductive HF belt tension sensors

• Extremely precise tape time counter (minutes and seconds)
• Electrically:
• 4 balanced microphone inputs
• Built-in mixer for 2 selectable stereo channels
• On request also with CCIR equalization

Remarks

• The "big Revox" closes the gap between the amateur top class and the purely professional studio machines.
• Overload resistance of all inputs better than 40 dB

But has the same problem in this class - like the PR99 Mark1 - NO TIMER/Locator!!HW

!! In progress! The information is still incomplete and partly not quite correct!

• Other models of the same series:
• Revox A 77
• Revox A 700
• Revox B 77
• Revox PR 99

• Other models in the 700 series:
• [[Preceiver:
• Revox A 720

• Power amplifier:
• Revox A 722

• Quadro power amplifier:
• Revox A 724

Pictures

• Picture: Revox A 700

• Picture:Revox A700 2.jpg
• Picture:Revox A700 3.jpg
• Picture:RevoxA700 4.jpg

Reports

• Detailed review with detailed measurements in "hifi-report 1974/75" (fono forum)