Revox B77 2 tracks

Maintenance repair

Germany 1974

4 tracks
3 Engines
Speed ​​9.5 - 19 cm / s
Speed ​​accuracy ± 0.2%
Wow e flutter ±0,08% a 19 cm/s
Wow e flutter ±0,1% a 9,5 cm/s
Maximum coil diameter 26.5 cm
Minimum diameter of the core 6 cm
Rewind time 135 s for 1100 m
Frequency response 30 Hz - 20 kHz +2 -3 dB at 19 cm / s
Frequency response 50Hz - 15kHz ± 1.5dB at 19cm / s
Frequency response 30 Hz - 16 kHz +2 -3 dB at 9.5 cm / s
Frequency response 50Hz - 10kHz ± 1.5dB at 9.5cm / s
Distortion 0.6% at 19cm / s
Distortion 1% at 9.5 cm / s
2-track signal to noise ratio 67 dB at 19 cm / s
2-track signal to noise ratio 64 dB at 9.5 cm / s
4-track signal to noise ratio 63 dB at 19 cm / s
4-track 60 dB signal to noise ratio at 9.5 cm / s
Clearance 75 dB at 19 cm / s
60 dB mono speaker, 45 dB stereo
Oscillator frequency 120 kHz
Low mic input sensitivity 0.15 mV 2.2 kOhms
High mic input sensitivity 2.8 mV 110 kOhms
Radio input sensitivity 2.8 mV 20 kOhms
Aux input sensitivity 40 mV 220 kOhms
Line output max 1.55 V Ri 390 - 1500 Ohms
Uscita radio max 1,55 V Ri 4,7 kOhms