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ID = 5401
Tube type:  Triode-Heptode 
Identical to 12FX8
Similar Tubes
Normally replaceable-slightly different:

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 12.6 Volts / If 0.27 Ampere
Description Triode-heptode designed to operate with 12.6V anode voltage. 
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
12FX8: Private collection
Emilio Ciardiello

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12FX8: Essential characteristics
Peter Hoddow

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12FX8: RCA Manual RC-21
Heinz Höger

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from Just Qvigstad

Usage in Models 2= 1959? ; 8= 1960? ; 2= 1962? ; 1= 1962 ; 2= 1963

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):15

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