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ID = 20506
Tube type:  Double Tetrode 
Identical to QQV04-6
Similar Tubes
Normally replaceable-slightly different:

Base Loctal-8, B8G (Sylvania, 1938) 2 Sidecontacts.
Was used by Transmittertube (Radio)
Filament Vf 12.6 Volts / If 0.3 Ampere / Half indirect / Specified voltage AND current AC/DC

Heizfaden-Mittelanschluss, daher auch Betrieb mit 6.3 V und 0.6 A

Information source Röhren-Taschen-Tabelle, (Franzis RTT)   

sp90_g.gif QQV04-6: RTT Schwandt
Günther Stabe † 19.8.20

Just Qvigstad

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