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ID = 30714
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to Wecovalve_4pin
Similar Tubes
Other base:
  215A ; 215A_Nissl ; 4215A ; CW-1344 ; CW-38015 ; CW1344 ; R215A ; VT-5 ; Wecovalve

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 0.85 Volts / If 0.25 Ampere / Direct / Battery =

Two sets of data are listed by Mullard. Type "A" for use as a detector with 15 -25V on the anode. Type "B" for use as an amplifier with 30-50V on the anode.

Dimensions (WHD)
incl. pins / tip
x 16 x 90 mm / x 0.63 x 3.54 inch
Information source Wireless World (The), London (WW, 79)   September 30 1925
History of the British Radio Valve to 1940   Pages 44,55,56,60,88,92 & 118

b4_1~~78.png Wecovalve_4pin: Fin Stewart
Fin Stewart

Just Qvigstad
Wecovalve_4pin: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

Collection of



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