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ID = 20524
Tube type:  Double Tetrode 
Identical to YL1071 = 8116
Similar Tubes
Heater different:

Base Septar (1+6 pins) 2 Top contacts.
Was used by Transmittertube (Radio)
Filament Vf 26.5 Volts / If 0.45 Ampere / Indirect

Durch Heizfaden-Mittenanschluss auch Betrieb mit 13.25 V und 0.9 A möglich.

Weight 71 g / 2.50 oz
Information source Röhren-Taschen-Tabelle, (Franzis RTT)   
YL1071: O.F.
Otto Frosinn

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YL1071: RTT Schwandt
Günther Stabe † 19.8.20

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YL1071: Valvo,Senderöhren, 1983
Anonymous 15 Collector

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Usage in Models 1= 1970??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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