Sorry, this page is not translated yet. Automatic translation used.
Since 1949, the Vaf M-697 mains tube radio has been produced by the VEF Electrotechnical Plant. Radio "Vaf M-697" was created on the basis of the receiver "Vaf M-557". In the new receiver, the IF control bandwidth control circuit was eliminated, which was replaced by a timbre tone switch of the step type, which did not have the best effect on the reception quality. The owners of the receiver had claims of instability of the local oscillator in the HF range. After 8 months of production, the model was discontinued and replaced with a new, more refined model, Baltika. The receiver is assembled on 6 lamps. The frequency converter is made on a 6A7 lamp, a UAC on a 6K7 lamp, an AGC detector and a 6G7 preamplifier of the low frequency amplifier, a 6P6S terminal PA, an 6E5S optical tuning indicator, a 5C4S rectifier unit. The speakers used a dynamic highly sensitive loudspeaker with a combined magnetic system with a permanent magnet and a bias coil, which is also used as a filter choke. Output power 2 watts. Ranges: DV 150 ... 410 kHz, CB 520 ... 1500 kHz, HF 4.28 ... 12.1 MHz. The IF is 469 kHz. Sensitivity from the antenna on the DV and CB 200 µV, KV 300 µV, from the pickup jacks 0.25 V. The adjacent channel selectivity is 26 dB on the DV, CB, 12 dB on the HF band. The attenuation of the signal in the image channel more than 30 dB in the ranges of DV, SV and 12 dB on HF. The range of reproduced sound frequencies is 100 ... 4000 Hz. Power consumption 67 watts. The dimensions of the receiver 560x360x250 mm, weight 13 kg. The plant produced and fully equipped kits for self-assembly receiver "Vef M-697".