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B309

Information - Help 
ID = 21211
       
Country:
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Double Triode   Universal 
Identical to B309 = 12AT7
Similar Tubes
Other class quality (otherwise equal):
  QA2406

Base Noval, B9A
Filament Vf 12.6 Volts / If 0.15 Ampere / Indirect / Parallel / series AC/DC
Description

Using the centre-tapped heater, can also be operated at 6.3V 0.3A.

 
Text in other languages (may differ)
Literature Röhren-Taschen-Tabelle, (Franzis RTT)   
 
gb_gec_b309_valve.jpg
B309: H.C.
Howard Craven

 
no15_g_28.gif
B309: RTT Schwandt
Günther Stabe

 

Usage in Models 1= 1956

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


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