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ID = 20465
Tube type:  Double Tetrode 
Identical to YL1220
Similar Tubes
Normally replaceable-slightly different:
Heater different:

Base Noval, B9A
Filament Vf 13.5 Volts / If 0.28 Ampere / Indirect / Parallel, (AC/DC)
Description Zwei Heizfäden seriell (~ Heizfadenmitte), daher auch Betrieb mit 6,75 V und 0,56 A 
Literature Röhren-Taschen-Tabelle, (Franzis RTT)   
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YL1220: RTT Schwandt
Günther Stabe

YL1220: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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