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ID = 21300
Brand: Radioröhrenfabrik GmbH (RRF) (CHF Müller // RRF // Valvo); Hamburg
Tube type:  Triode, vacuum   Power/Output 
Identical to 201A_RRF

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 5.2 Volts / If 0.25 Ampere / Direct / Battery =

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

Information source Saga of the Vacuum Tube, Tyne   p.454
201A_RRF: Rundfunkpraktikum 1926
Anonymous 15 Collector

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