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The valve looks like a late (1960s) specimen of the pre-war American Type 211. Valves of this type were at one time used professionally as audio modulators or sub-modulators.
This valve was originally used by Radio Newcastle.
It is a directly heated power triode with a special four pin base.
The design purpose was as a high power audio amplifier.
Reference: Observation.


Updated April 24, 2013.
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