Medium power beam tetrode originally released as a metal valve (12A6) in 1941, the glass version appeared in 1943. It appears to have been designed as an economical output amplifier for use in airborne communication equipment.
12.6 V indirectly heated cathode.
Unusual in that there is no direct 6.3 volt equivalent. (The 6A6 is a totally different type of valve.)
Manufacturer: Tung-Sol, USA

Physical Description

Tubular glass bulb on octal base with 7 pins present.

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