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VT100B_GPO

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ID = 48881
       
Country:
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Developer: Mullard Radio Valve Co. Ltd.;  
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 very rare. ***
Identical to VT100B_GPO = HL1320 = HL13C
Similar Tubes
Normally replaceable-slightly different:
  4D1_Brimar ; CV3502 ; VT100_GPO

Base British-7-Pin, old (M7A)
Was used by Telephony
Filament Vf 13 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC
Literature -- Original-techn. papers.   
-- Collector info (Sammler)   
 

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