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ID = 21301
Brand: Radioröhrenfabrik GmbH (RRF) (CHF Müller // RRF // Valvo); Hamburg
Tube type:  Triode, vacuum   Power/Output 
Identical to 201B_RRF
Similar Tubes
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.32 Ampere / Direct / Battery =

Wurde als "Valvo Lautsprecher 201 B" angeboten. Siehe Inserat beim Hersteller.

Tube prices 1 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   pp.453,454
Katalog Grüner 1926/27.   
Vox-Haus, Katalog 1926/1927
201B_RRF: © Museum der Experimentalphysik, Innsbruck
Heribert Jung

201B_RRF: eBay
Dietmar Lechner

201B_RRF: Die Röhre, H. C. Riepka, 1926
Gerhard Eisenbarth

from Just Qvigstad

Usage in Models 1= 1926

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

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