Car radio `` A-12 ''.

Car radio and electrical equipment.Car radio and electrical equipmentSince 1959, the A-12 automobile radio has been producing the Murom radio plant. It is a six-tube dual-band superheterodyne powered by a 12.8 V battery with a negative grounded. Designed for the GAZ-21 car where the noise level of the ignition system is reduced. Ranges DV and SV. Sensitivity for SV 100, DV 250 μV. Selectivity 28 dB. When the signal voltage at the input changes by 40 dB, thanks to the AGC system, the output voltage changes by 8 dB. IF 465 kHz. Output power 2 W. The bandwidth of the entire path is 100 ... 5000 Hz. Power consumption 42 watts. The receiver can be tuned to any radio station and this setting is fixed by a mechanical device. In total, you can fix 5 stations: 2 of them in the LW range and 3 in the MW. In the future, tuning to fixed stations and switching bands is done by pressing the corresponding button. The set includes power supply units VP-9 or BP-12 with the help of which the battery voltage is converted into high voltage required to power the radio tubes. In the VP-9 unit, the conversion is carried out by a mechanical vibrator, and the BP-12 power supply is built on transistors. The receiver consists of 3 parts: a receiver, a power supply unit and a loudspeaker mounted on a reflective board. Since 1961, the plant has produced a radio receiver of the `` A-12A '' type, which has similar characteristics, electrical circuit and design, but differs in the use of already printed wiring.