Summary

Tetrode, known at the time as a screen-grid valve, used as a class A R. F. amplifier. Manufacturer: A. C. Cossor, England.
This valve type was introduced in 1928 but, based on the bulb shape, this example was manufactured much later than that, probably in the mid 1930s.
2 volt directly heated cathode.

Physical Description

Shouldered bulb (with top cap missing) on 4 pin European style base

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