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ID = 20503
Tube type:  Double Tetrode 
Identical to QQV02-6 = CV2466
Similar Tubes
Normally replaceable-slightly different:

Base Noval, B9A
Filament Vf 12.6 Volts / If 0.3 Ampere / Indirect / Parallel / series AC/DC
Description Tapped heater also permits operation at 6.3V 0.6A. 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
Literature Röhren-Taschen-Tabelle, (Franzis RTT)   
QQV02-6: RFJ
Roy Johnson

QQV02-6: RTT Schwandt
Günther Stabe

QQV02-6: Mullard-original papers
Otto Galli

Usage in Models 1= 1960?? ; 2= 1964

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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