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ID = 16961
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  Transmitting Triode, air cooled 
Identical to 150T
Similar Tubes
Different maximum ratings:
First year 1934 Initially advertised in QST 1934
Successor Tubes 1935   500T   50T   300T   250T  

Base UX-Base (4 Pins (2 thick, USA 1924, UX) (Codex=Bz)
Filament Vf 5 Volts / If 10 Ampere
Description After working at Heintz & Kaufman, Bill Eitel, W6UF and Jack McCullough, W6CHE had engineered their first own product, known as 150T, followed by 35T, 50T, 300T, 500T, 100T etc.

During the development of the HK354 at H & K they had realized that the ideal transmitting tube of that time should be an extremely "hard" tube with a thoriated tungsten filament, Nonex glass bulb, cylindrical elements supported by the bulb with no internal ceramic insulators which could be a source of arc-over and plate and grid made of tantalum which could be made almost entirely free of gas so the tube need not have a "getter". The 150T was first advertised in QST in 1934 and was exhibited at the ARRL Convention 1934 in Sacramento. After that the tube was produced in series 
Text in other languages (may differ)
Literature Taschenbuch zum Röhren-Codex 1948/49   
  150T: ARRL The Radio Amateur's Handbook 1936
Götz Linss
150T: Eitel-McCullough Print Ad
Franz Scharner

150T: ARRL Handbook 1972
Michael Schlör


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