Antique radios, Old Time Radios
PR-1C
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Country:
United States of America (USA)
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| Identical to |
PR-1C
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Successor Tubes
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1927
UX240
PT-240
PJ-11
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| Base |
UV-Base (4 Pins+Bayonet, USA 1914 WE)
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| Was used by |
Industrial |
| Filament |
Vf 5 Volts / If 0.25 Ampere / Direct / Battery = |
| Description |
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. It is a High-mu tube.
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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
Tube Lore (II) p, 214
-- Collector info (Sammler)
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Just Qvigstad
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Collection of
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