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ID = 5621
Tube type:  Triple Diode 
Identical to 19GQ7
Similar Tubes
Heater different:

Base Noval, 9 pin miniature (USA pico-9) B9A
Filament Vf 18.9 Volts / If 0.15 Ampere / Indirect / Specified current AC/DC ~ = (Series working)
Tube prices 1 Tube prices (visible for members only)
Information source Essential Characteristics, GE 1973   
19GQ7: Collection Patrice ZEISSLOFF
Patrice Zeissloff

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19GQ7: Tung-Sol Data Sheet
Egon Penker

19GQ7: Tung-Sol Data Sheet
Egon Penker

from Just Qvigstad

Usage in Models 1= 1963?? ; 4= 1964? ; 1= 1967?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):6

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