Revox A720
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SPECIAL FEATURES |
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Tuner Section |
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1. |
Quartz stabilized frequency synthesizer (channel raster oscillator). Very stable; no frequency drift. |
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2. |
Five digit frequency display |
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3. |
Pre-set instant tuning for five stations |
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4. |
Stepped manual tuning. Tuner will stop on exact frequency when tuned to assigned channel. |
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5. |
Endless tuning scale. Scale range from 87.00 to 107.95 MHz. Tuning above 107.95 MHz instantly steps to bottom of scale (87.00). |
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6. |
Meters for signal strength and frequency 'lock in'. |
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7. |
Switchable noise filter for fringe area reception stereo stations. Improves signal to noise without sacrificing frequency response. |
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8. |
Digital FM demodulator (pulse counter) |
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9. |
Stereo Decoder with 76 kHz oscillator, integrated frequency divider and 'phase-locked loop' frequency. |
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10. |
Phase-linear passive IF filter. |
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11. |
Five stage integrated wide-band limiting amplifier. |
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12. |
Remote control facility |
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13. |
Antenna sockets for coaxial cable (BNC) and turn-lead cable (DIN). |
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Audio Section |
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1. |
Volume and balance control by means of sliding type faders. |
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2. |
Stepped independent tone controls for bass, presence and treble |
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3. |
Two headphone outputs on front panel. The headphone amplifier includes a specially development 'binaural network'. When switched into the circuit low frequency signals are distributed to both channels, with an appropriate time delay providing true stereophonic listening even with headphones. |
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4. |
Inter-connecting facilities for two tape recorders. Transfer between recorders available without further connections or record-off tuner on one while playing back on the other. Off-tape monitoring for both tape recorders. |
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5. |
Additional tape output on front panel |
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6. |
Two stereo phono and one stereo auxiliary input |
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7. |
Pre-set level controls on all five inputs (left and right channels) screw driver adjustable. |
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8. |
High and low pass filters effective on all inputs. |
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9. |
Loudness switch to obtain physiological loudness control. |
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10. |
Two switchable stereo outputs (for two independent stereo amplifiers). |
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11. |
Remote control facility for volume, balance and loudness control (available shortly) |
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12 |
Remote switching of supply to power amplifiers. |
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Technical Data: Digital FM Tuner A720 |
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Tuning Range |
87.00 MHz - 107.95 MHz, |
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Tuning Accuracy |
0.005% |
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Sensivity |
Mono 1 µV, stereo 10 µV, measured at the 60 ohm antenna input for a signal to noise ratio of 30 dB with reference to 15 kHz deviation |
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Station Selectivity |
60 dB at a separation of 300 kHz |
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Image Response |
100 dB |
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Spurious Response |
100 dB |
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IF Suppression |
100 dB |
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Capture Ratio |
1 dB measured at ± 40 kHz deviation |
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Frequency Response |
30 Hz - 15 kHz ± 1 dB |
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De-Emphasis |
50 µsec (or 75 µsec) |
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Distortion |
0.2% at 1 kHz and a deviation of ± 40 kHz(Mono and Stereo L = R) |
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Signal to Noise Ratio |
Mono 70 dB |
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Stereo Crosstalk |
40 dB at 1 kHz |
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Pilot-Signal and |
50 dB wide band measurement referred to ± 75 kHz deviation. |
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AM-Suppression |
54 dB referred to ± 22.5 kHz deviation 30% AM / 400 Hz 1 mV/60 Ohm Antenna Input Voltage |
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Audio Output |
1.5 V/ ± 40 kHz deviation on Out 1 + 2 |
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Antenna |
240 - 300 ohm DIN symmetrical |
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Technical Data: Pre-Amplifier A 720 |
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Inputs |
AUX |
100 mV |
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Outputs |
OUT 1 |
1.5 V / Load not less than 10 kOhm |
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Tone Control and Filter |
BASS TREBLE HIGH FILTER |
80 Hz ± 8 dB (8 x 2 dB)8 Hz ± 8 dB (8 x 2 dB) 3 Hz ± 8 dB (8 x 2 dB) 50 Hz / -3 dB; 25 Hz / -18 dB 10 kHz / -3 dB; 20 kHz / -10 dB (-40 dB) 100 Hz / +14 dB; 10 kHz / +5 dB |
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Distortion |
0.1% at an output level of 1.5 V |
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Intermodulation |
0.1% at an output level of 1.5 V |
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Frequency Response |
20 Hz - 20 kHz ± 1 dB |
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Signal to Noise Ratio |
AUX, TAPE 1 + 2: 85 dB |
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Crosstalk |
60 dB at 1 kHz |
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