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ID = 28953
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Triode, vacuum   RF/IF-Stage 
Identical to 210HL_Cossor
Similar Tubes
Normally replaceable-slightly different:
  210HL ; K30C ; PM1HL
First year 1926 Saga of the Vacuum Tube, Tyne page 376

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 2 Volts / If 0.1 Ampere / Direct
Description Late in 1926 Cossor introduced their new Kalenised filament. Exactly what the Kalenising process was they did not state, making only the modest claim that it "gives off a torrent of electrons partically without heat". This filament was used in the Cossor Point One, 210D and 210H valves, and also in a power valve denoted only as the Stentor Two, to which the number 215P was later assigned. 
Information source Saga of the Vacuum Tube, Tyne   page 376
Rudolf Osterkamp

210HL_Cossor: rtt
Michael Schlör


Usage in Models 1= 1937?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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