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ID = 77876
United States of America (USA)
Brand: Amperex; New York
Tube type:  Thyratron 
  Ca. 1925 up to 1945 no serial production. For instance only development samples. *****
Identical to GC-873
Similar Tubes
Multiple differences or of other kind:

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Top contact with a cap.
Was used by Industrial
Filament Direct

No data found on this tube. It looks to be a mercury thyratron triode with external control electrode. The date on the samples is August 1941. We remember that Amperex had gained at that time a considerable experience on tubes controlled by electrostatic flields: few years before they desiged C-100A and its derivatives for Collins. Well, our samples recall the shape of the C-100A, with the difference that droplets of mercury can be observed inside the bulbs.

Likely experimental external-grid prototypes functionally similar to the 873 gridded thyratron, but smaller in size.

GC-873: Private collection
Emilio Ciardiello


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