Summary

Tetrode (not a screen grid valve) - a space charge valve where the inner grid is connected to a positive bias to allow the valve to operate satisfactorily at a much lower anode voltage than a conventional triode (5 to 25 V).
3.4 - 3.8 V directly heated cathode.
Manufacturer: La Radiotechnique, France.

Physical Description

Tubular bulb mounted on 4 pin European style base (metal shell) and side terminal; mounted on display block

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