General purpose triode equivalent to UV201A. 5.0 volt directly heated cathode.

'OK' was a house brand of S. S. Kresge & Co. (K Mart in the U.S.A.)

Physical Description

Sectioned conical glass bulb with American style 4 short pin (UV). Bakelite base mounted on display block with a complete example of a similar valve (ST 021605).

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