Summary

Triode with two grids and one plate designed for detection. Manufacturer: The Ken-Rad Corporation, Owensboro, Kentucky, USA.
Referred to as Wunderlich tubes but possibly independently developed by Ken-Rad. These tubes were only used by a very small number of manufacturers for a couple of years.
2.5 V directly heated cathode.

Physical Description

Conical bulb on six pin American style base.

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