Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 16731
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Thyratron   Text 
  Ca. 1925 up to 1945 rare.
Identical to GT1C = VGT128 = VT189_GPO = 10E/15 = CV1128
Similar Tubes
Other base and other heater:
Successor Tubes NGT2   GT3  

Base Europe 5-Pin (O5A, B5) (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.3 Ampere / Indirect / Parallel, (AC/DC)

Va<500 peak. Ia<300mA mean, 1A peak. (Osram data 1938). The impedance of the anode circuit must ensure that the current can never exceed 1.0 amp. Special attention must be given to this point in circuits where the GT1C discharges a condenser.

Cathode preheat time of >30 seconds is essential to prevent premature ageing.

Dimensions (WHD)
incl. pins / tip
45 x 120 x mm / 1.77 x 4.72 x inch
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   Osram data 1938, GEC Nov 1949
Babani, International Radio Tube Encyclopaedia
Patrice Zeissloff

GT1C: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

GT1C: own collection
Peter den Boer

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]