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ID = 81294
United States of America (USA)
Brand: General Electric Co. (GE); Bridgeport CT, Syracuse NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Triode, vacuum   Power/Output 
Identical to PR-1C
Successor Tubes 1927   UX240   PT-240   PJ-11  

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Industrial
Filament Vf 5 Volts / If 0.25 Ampere / Direct / Battery =

In 1923, GE engineers began work on a tube similar to a UV201A but with a much higher amplification factor. The tube was designated PR1 and was used for experimental work at radio station WGY. te tube originally had a brass UV  base but by August 1925 this base changed to the newly introduced UX base.. The tube was used in telephone repeaters and, condenser microphone ampifiers. Further development of the tube followed and it became the UX240, being first advertisd in QST magazine, April 1927.

Dimensions (WHD)
incl. pins / tip
x 108 x 45 mm / x 4.25 x 1.77 inch
Weight 47 g / 1.66 oz
Information source Saga of the Vacuum Tube, Tyne   Pages 317 &318

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