Sensibly equivalent¶ to:
CV133 CV852 EC90 L77 V741
The 6C4 triode was specified as both an amplifier and an RF power valve. In the latter role it would deliver 5.5 Watts. With a very small envelope volume, this would make it ideal for hand portable equipment. In larger apparatus it could deliver enough drive power for much larger PA's.
The Brimar data-sheet says the curves match half of the 12AU7 but the anode current can be twice the value at 25 mA in Class C service.
The thin glass tube envelope is 18 mm in diameter and has an overall length, excluding the B7G base pins, of 45 mm.
References: Datasheet & 1040.
Absolute Maximum Operating Conditions¶
Updated January 26, 2013. shape:thin.glass.tube construction:all.glass type:triode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.a pin:2.k pin:3.h pin:4.h pin:5.a pin:6.g1 pin:7.k