Network tube radios '' Kazakhstan '' and '' Kazakhstan-2 ''.
Amplifying and broadcasting equipmentThe network tube radios "Kazakhstan" and "Kazakhstan-2" were produced from October 1963 and January 1964 by the Petropavlovsk plant named after S.M. Kirov. The broadcasting receiver "Kazakhstan" was developed in 1962 to replace the outdated model "TPS-54". The receiver became successful in terms of circuitry and design and stayed on the assembly line until mid-1975. In total, over the years of production, 150 thousand copies were produced, and the mass production fell on the period 1970 ... 1974. During production, the receiver has undergone several circuit and technological upgrades. The Kazakhstan-2 receiver underwent modernization and was distinguished by the presence of a second local oscillator for receiving telegraph and single-sideband signals. At the same time, the base receiver was modernized, in which 10 lamps remained after the alteration. "Kazakhstan" is a top-class receiver. It uses 14/12/10 finger lamps, a 4-section tuning capacitor, and an electron-beam tuning indicator. The receiver could be used as a broadcast, household, control, for radio amateur communications, etc. The receiver is designed to operate over a long period of time. The radio receiver has 7 bands, these are DV, SV and 4 KV sub-bands, in which continuous overlap is carried out at frequencies from 3 to 18 MHz and the VHF-FM range. The range switch is drum, with soft connection of contacts. The radio receiver is assembled on finger lamps, including a zener diode of anode voltage and a bartter for stabilizing the heating of local oscillators. In the FM range there is an AFC, when receiving AM signals, a deep AGC and an IF bandwidth adjustment from 5 to 18 kHz are provided. The radio receiver can work with several types of antennas and with two antennas simultaneously, providing, together with the AGC, reception with practically no fening in the HF bands. Not all upgrades were successful, so after replacing the 6X2P detector with semiconductor diodes, the dynamic range of the AGC narrowed, and in the modernization, where the detectors and AGC are combined in a 6N2P lamp, the AGC deteriorated its properties. After replacing the 6N6P amplifier lamp with 6P14P, and the push-pull output transformer with a single-ended one, the sound, although it became more powerful, appeared significant distortions of which were not there before.
