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The radio car "A-4" since 1948 produced the Murom radio plant. A-4 is an upgrade of the A-695 receiver (the A-3 radio was also released in small series), which allowed it to be used in the GAZ-12, in which the battery voltage is 12 V. the receiver circuit remained almost unchanged, with the exception of the filament circuit, where a series-parallel connection of the filaments of individual lamps was applied. The power of the anodes of the lamps is carried out through the vibrator, structurally performed separately. Characteristics of the receiver are similar to the model "A-695". The receiver was made until the end of 1952.