Country of Manufacture:Switzerland
Speeds: 3 3/4, 7 1/2, 15
Max Reel Size("): 10.5"
Number of heads: 3
Head Composition: Permalloy
Head Configuration: Stereo
# Motors: 3
Voltage(s): 110-120v, 220-240v
Frequency Response:(from tape at - 20 VU): 3¾ ips: 30Hz to 16kHz +2
Wow and Flutter:15 ips: better than ± 0,06% 7½ ips: better than ± 0,08% 3¾ ips: better than ± 0,1%
Sound quality rating:7 / 10
Long-term reliability rating: 7 / 10
Billed as a ‘totally professional machine, the Revox A700 stereo tape recorder was a servo controlled, three motor, three speed (3¾ , 7½ , 15 ips) machine with a 10½ inch maximum reel capacity. It was the follow-up to the fabulously successful A77 but it never really achieved the same heights of popularity, being
almost 2½ times the price of its predecessor. It was, however, a very fine machine and is quite a rare bird these days.
Extensive use was made of integrated circuits in both control logic and
audio circuitry. The tape transport mechanism employed three servo controlled
AC motors with a quartz clock generating a reference signal for control
of capstan motor speed at 3¾ , 7½ , and 15 ips.
A speed sensor ring operated simultaneously over the entire circumference
of the capstan motor to detect total motor motion.
-3dB. 50Hz to 18kHz 1.5dB / Tape slip: not exceeding 0.1% / Tape counter: read-out in minutes and seconds (4 digits). real-time indication at 7½ ips. / Equalisation: to NAB standard / Signal to noise ratio: weighted as per ASA A, measured via tape at 15 ips better than 65 dB at 7½ ips better than 66 dB at 3¾ ips better than 63 dB / Peak recording level: 6 dB over 0 VU for a tape flux of 514 nWb / m / Level metering: VU-meter as per ASA-standard, with optical overload indication: Overload threshold: +6 dB, 514 nWb / m Response Time: 10 msec Delayed Decay: approx. 0.5 sec. / Crosstalk (1000Hz): mono better than 60 dB. stereo better than 45 dB / Distortion: Measured via tape at peak level or 0 VU respectively (1000 Hz) at 15 ips and 7½ ips better than 2% or 0.6 % respectively at 3¾ ips better than 3% or 1% respectively / Equalization: as per NAB Standard / Semi-conductors: 19 Integrated Circuits, 2 large scale Integrated Circuits, 93 Transistors, 92 Diodes, 7 Full Wave Rectifiers / Inputs: mic lo 0.15 mV 6 kOhm mic hi 1.8 mV 6 kOhm radio 1 stereo input, Sensitivity 3 mV / 33 kOhm phono 1 stereo input, equalized as per RIAA Sensitivity: 2.5 mV 50 kOhm aux (2) Sensitivity 40 mV 100 kOhm / Outputs: fixed level: line A: 1.55 V. Ri = 5 kOhm line B: 1.55 V. Ri = 5 kOhm radio (DIN): 0.775 V. Ri = 10 kOhm adjustable level (volume, tone): headphone: 4.9 V. Ri = 100 Ohm per output power stage: 3.1 V. Ri = 100 Ohm / Tone controls: bass, ± 8 dB at 80 Hz in 2 dB steps. treble, ± 8 dB at 8 kHz in 2 dB steps / Dimensions: 19 x 18¼ x 8¾ ” (483 x 460 x 225 mm) / half or quarter-track stereo versions