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A537

Information - Help 
ID = 13707
       
Country:
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Triode, vacuum 
Identical to A537
Similar Tubes
Normally replaceable-slightly different:
  A1178

Base Side contacts.
Filament Vf 4 Volts / If 0.4 Ampere
Description

Special for microphone amplifiers. Gm=1.55mA/V. Amp Factor=15.5, Z=10k, Va<150, Ia=3.3mA at Vg=-6. (Price 3.8EUR in 1938)

Replaced by the A1178.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
a537.jpg
A537: Own collection.
Stuart Irwin

 
a537_data.png
A537: MARCONI RECEIVIN VALVES, LONDON, 1938
Jose Casas-Avalos



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