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REVOX A720

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Technic details

Specifications

Type:
Digital FM Tuner Pre Amplifier
[FM-Tuner]
Tuning Range:
87 to 107.95MHz covering 420 channels in 50kHz steps
Tuning Accuracy:
0.005%
Sensitivity:
1µV (Mono)
10µV (Stereo)
Measured at the 75Ω input for a 30dB signal to noise ratio at a deviation of 15kHz

Static Selection:
60dB at 300kHz separation
Image Rejection:
100dB
Spurious Response:
100dB (fE ± fIF/2)
IF Rejection:
100dB
IF Frequency:
11MHz
Bandwidth:
130kHz (IF-filter)
5MHz (FM-demodulator)
Capture Ratio:
1dB measured at ±40kHz deviation
Frequency Response:
30Hz to 15kHz, ±1dB
De-emphasis:
50µs or 75µs
Distortion:
0.2% at 1kHz and ±40kHz deviation (Mono and stereo L = R)
S / N Ratio:
70dB referred to 75kHz deviation
Stereo Crosstalk:
40dB at 1kHz
Pilot Signal and Subcarrier Suppression:
50dB referenced to 75kHz deviation (Wide band linear measurement)
AM Rejection:
54dB referenced to ±22.5kHz deviation
30% AM (400Hz) and 1mV / 75Ω antenna input
Audio Output:
1.5V at 40kHz deviation (Outputs 1 + 2)
Antenna Inputs:
300Ω DIN symmetrical
75Ω BNC coaxial
[Pre Amplifier]
Inputs:
100mV / 100kΩ (2 x Tape / Stereo)
3mV / 50kΩ, adjustable ±5dB equalized as per RIAA (2 x Phono / Stereo)
100mV / 100kΩ adjustable (20dB) (AUX)
The overload margin on all inputs exceeds 30dB (1 : 30)
Outputs:
1.5V / Less than 10kΩ (2 x Output / Stereo)
200mV / Less than 50kΩ (2 x Tape / Stereo)
200mV / Less than 50kΩ (Tape Out / Stereo)
3V / 100Ω suitable for headphones with impedances of 5Ω and up (2 x Headphones / Stereo)
Tone Control:
±8dB at 80Hz, 8 x 2dB (Bass)
±8dB at 8kHz, 8 x 2dB (Treble)
±8dB at 3kHz, 8 x 2dB (Presence)
Filter:
At 50Hz / -3dB, at 25Hz / -18dB (Low)
At 8kHz / -3dB, at 20kHz / -18dB (High)
At 100Hz / +10dB, at 10kHz / +6dB (Loudness / -30dB)
Distortion:
0.1% at an output of 1.5V
I.M. Distortion:
0.1% at an output of 1.5V
Frequency Response:
20Hz to 20kHz, ±1dB
S / N Ratio:
85dB for auxiliary and tape inputs when terminated with 10kΩ
65dB for Phono inputs when terminated with 2.2kΩ
Crosstalk:
60dB at 1kHz
Semiconductors Used:
IC’s x 37, Transistors x 41, FET’s x 6, Diode Matrices x 2, Diodes x 63, Full-wave Rectifiers x 4, Digital Read-out Tubes (Long life variety) x 4

Power Requirements:
AC 110 / 130 / 150 / 220 / 240 / 250V, 50 / 60Hz
Power Consumption:
40W
Dimensions (W x H x D):
483 x 152 x 318 (330)mm
Weight:
12kg
Year:
1973

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