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 electrode size in a 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 stitched anode seen face on.
Side view of the central box of the anode.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
