Sensibly equivalent¶ to:
The 3A5 is a double triode with a centre tapped filament. The two sections in series would run from 2.8 Volts at 0.11 Amps. Although it could be used for RF amplification it would be mainly used as an audio power amplifier. With both sections operated as Class B push-pull the valve would produce an output of 2 Watts.
From the side, the flat oval of the anode is clear. The anode is blackened and this is unusual in battery valves.
The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 46 mm tall.
Reference: Datasheet. Type 3A5 was first introduced in 1942.
Absolute Maximum Operating Conditions¶
Updated April 07, 2015. shape:thin.glass.tube construction:all.glass type:double.triode age:1940.1950 base:b7g heater:1.4v pins:7 pin:1.f pin:2.a(1) pin:3.g1(1) pin:4.fct pin:5.g1(2) pin:6.a(2) pin:7.f