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ID = 21557
Tube type:  Vacuum Pentode   Power/Output 
Identical to XL84 = 8BQ5
Similar Tubes
Heater different:

Base Noval, B9A
Filament Vf 8.5 Volts / If 0.6 Ampere / Indirect / Series, AC/DC /
Literature Röhren-Taschen-Tabelle, (Franzis RTT)   
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XL84: RTT Schwandt
Günther Stabe


Usage in Models 28= 1959?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):28

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