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ID = 20308
Great Britain (UK)
Brand: Common type Great Britain tube/semicond.
Tube type:  Transmitting Tube, Pentode, air cooled 
Identical to VT104 = CV1104 = 10E/215
Similar Tubes
Normally replaceable-slightly different:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Filament Vf 6 Volts / If 1.3 Ampere / Direct

30W max plate dissipation, 15MHz max full ratings operatinf frequency. Separate G3 pin for suppressor grid modulation.

Information source -- Original-techn. papers.   CV1104 spec sheet

vt104_so.png VT104: rtt
Anonymous 10 Collector

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