Summary

X201A triode made by Bond Electric Corporation, in the United States. It is a general purpose valve. It has a 5.0 volt directly heated cathode. It is identical to valve type UX201A..

The 201A, 01A and valves with the same charactertistics were produced ibn huge numbers in the U.S.A. in the 1920s. At least 700 brands have beeen recorded.

Physical Description

Conical glass bulb with four pin UX style base.

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