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ID = 21053
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Tube type:  Triode, vacuum   Audio Frequency 
Identical to H210_Hivac
Similar Tubes
Normally replaceable-slightly different:

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 / Battery =

The Hivac H210 differs from the More usual H210 in that it is a lower impedance, higher Gm tube.


Ra 22k ohms; Gm 1.15mA/V

Information source Babani, International Radio Tube Encyclopaedia   
- - Manufacturers Literature   
History of the British Radio Valve to 1940

h210_mazda_so.png H210_Hivac: rtt
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