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ID = 28953
Great Britain (UK)
Brand: Cossor, A.C.; London
Developer: 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
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct

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
History of the British Radio Valve to 1940
Rudolf Osterkamp

More ...
210HL_Cossor: rtt
Michael Schlör


from Just Qvigstad

Usage in Models 1= 1937?

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

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