Network tube radio receiver "October".
Tube radios.DomesticSince 1954, the network tube radio receiver "October" has been produced by the Leningrad Metalware Plant. The receiver is a nine-lamp superheterodyne of the 1st class operating in the LW, MW and 4 KV bands in the KV1 4 ... 6.3 MHz, KV2 7 ... 7.4 MHz, KB3 9.2 ... 10 MHz sub-bands , KB4 11.5 ... 12.1 MHz. Receiver sensitivity on all ranges 50 µV. Adjacent channel selectivity is about 60 dB. The speaker, which uses two 5-watt loudspeakers with different resonant frequencies, effectively reproduces the audio frequency range from 60 to 6500 Hz. High speaker output eliminates overload and improves sound quality. The maximum output power of the low frequency amplifier is 10 W. There is a tone switch block and filters to change the color of the sound. Switching ranges shorts the speaker leads for quiet switching. In the high-frequency circuits, new small-sized armored carbonyl cores SB-1A with high quality factor and small dimensions are used. The case is walnut veneered and polished. The Leningrad Metalware Plant produced the October radio receiver until June 1957, after which its documentation and production was transferred to the Radist Leningrad plant. The appearance of the receiver has been changed, and changes have been made to the design and circuit.
