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ID = 36022
United States of America (USA)
Brand: Heintz & Kaufman Ltd. (Gammatron); San Francisco, CA
Developer: Heintz & Kaufman Ltd. (Gammatron); San Francisco, CA 
Tube type:  Transmitting Triode, air cooled 
Identical to 24-G-Gammatron = 24-G = HK24G = 3C24 = VT-204

Base UX-Base (4 Pins (2 thick, USA 1924, UX) Sidecontact and top contact

Actually this is just a 24G. In this case the prefix 'Gammatron' is not related to the operating principle of the tube, rather it was used by Heintz & Kaufman as their trade mark.

Text in other languages (may differ)
24-G-Gammatron: EE als Muster einer Gammatron
Ernst Erb

24-G-Gammatron: ARRL Handbook 1972
Michael Schlör

24-G-Gammatron: The Radio Amateur's Handbook, 1942
Stig Comstedt

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