Summary
The first type of remote cut-off Tetrode to be manufactured by RCA. Originally called UY-235, abbreviated to 35 in 1932. Manufacturer: RCA Radiotron Co., Inc. Harrison, New Jersey, USA. 2.5 V indirectly heated cathode.
The remote cut-off or variable-mu tube was developed by Ballantine and Snow, working for the Boonton Radio Corporation. The first commercial type was the 551 manufactured by Arcturus, the UY-235 made by RCA was virtually identical.
Physical Description
Conical bulb (with top cap) with 5 pin UY style base.
More Information
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Collecting Areas
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Manufacturer
RCA Radiotron Co., Inc., Harrison, New Jersey, United States of America, circa 1932
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Inscriptions
Bulb: RCA Base: RCA Raditron/35
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Classification
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Category
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Discipline
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Type of item
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Overall Dimensions
124 mm (Length), 44 mm (Outside Diameter)
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References
The remote cut-off or variable-mu tube was developed by Ballantine and Snow, working for the Boonton Radio Corporation. Their invention was described in: Stuart Ballantine & H. A. Snow: Reduction of Distortion and Cross-talk in Radio Receivers by Means of Variable-mu Tetrodes. Proc. I.R.E., vol. 18, p. 2102, December 1930.
[Book] Stokes, John. 1982. 70 Years of Radio Tubes and Valves., 67 Pages
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