The VEF M-697 tube network radio receiver has been produced by the VEF State Electrotechnical Plant since 1949.
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The VEF M-697 radio receiver is based on the VEF M-557 receiver.
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In the new receiver, the IF bandwidth control circuit was excluded, which was replaced by a step-type RF tone switch, which did not affect reception quality in the best way.
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The owners of the receiver had complaints about the instability of the local oscillator in the HF range.
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After 8 months of production, the model was discontinued and replaced with a new, more advanced model, Baltika.
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The receiver is assembled on 6 lamps.
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The frequency converter is made on a 6A7 lamp, UPCH on a 6K7 lamp, an AGC detector and a 6G7 low-frequency pre-amplifier, a terminal amplifier on 6P6S, an optical tuning indicator on 6E5C, a rectifier unit on 5TS4S.
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The speaker uses a dynamic highly sensitive loudspeaker with a combined permanent magnet magnet system and a magnetizing coil, which is also used as a filter choke.
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Output power 2 watts.
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Ranges: LW 150 ... 410 kHz, CB 520 ... 1500 kHz, HF 4.28 ... 12.1 MHz.
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IF is 469 kHz.
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The sensitivity from the antenna to the LW and SV 200 μV, HF 300 μV, from the pickup sockets 0.25 V. Adjacent channel selectivity 26 dB on LW, CB, 12 dB on HF bands.
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The signal attenuation over the mirror channel is more than 30 dB in the ranges of LW, CB, and 12 dB at HF.
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The range of reproduced frequencies of sound is 100 ... 4000 Hz.
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Power consumption 67 watts.
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The dimensions of the receiver are 560x360x250 mm, weight 13 kg.
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The plant also produced fully equipped kits for self-assembly of the VEF M-697 receiver.
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