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VT30_GPO

Information - Help 
ID = 63214
       
Country:
Netherlands
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  UNKNOWN 
  <1925 extraordinarily rare. Production was less than 100 items. ****
Identical to VT30_GPO
Similar Tubes
Differences not known by us:
  VT30

Was used by Telephony
Filament Direct
Description

Tube made in Holland by Philips for use by the British Post Office in radio applications. According to Keith Throwers' book, only 52 tubes were made. No other information available.

Likely it was similar to the VT30

 
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 84 and 134

 

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