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ID = 5231
Tube type:  Double Triode 
Identical to 10GF7A
Similar Tubes
Heater different:
  13GF7A ; 6GF7A

Base Novar, B9E = bigger than Noval, USA 1959
Filament Vf 9.7 Volts / If 0.6 Ampere / Indirect
Information source Essential Characteristics, GE 1973   

10GF7A: RCA Receiver Tube-Manual 1975
Günter Kudicke

10gf7a_sockel.png 10GF7A: RCA Tube Manual
Peter Hoddow

Just Qvigstad
10GF7A: RCA Tube Manual
Peter Hoddow

Collection of



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