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ID = 28917
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Triode, vacuum   Audio Frequency 
Identical to WR1
Similar Tubes
Other characteristic (electr. data):
Heater different:
First year May.1925 Saga of the Vacuum Tube, Tyne page 375, 376
First Source (s)
1925 : British Radio Valves - The Vintage Years, Thrower p.49

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament If 0.3 Ampere
Description Corresponds to W1. An 8 ohm series resistor allowes to operate from 4 to 6 volt supply; if shortened by a thumbscrew the tube could be used with 2 volt L.T. 
Information source Saga of the Vacuum Tube, Tyne   1925 Brown Brothers Catalog 217
WR1: federico rubio
Federico Rubio-Moratalla

WR1: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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