General
Electric KR-3 and KR-4 Kenotrons
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The upper picture is of the air-cooled KR-3,
22” (55cms) long, the earliest commercially
known hot cathode rectifier valve by General Electric, developed by Saul Dushman in 1914, introduced in 1915, and which became
commercially available only in 1926 (Grigg,
The Trail of the Invisible Light, Charles C. Thomas, 1965, pp.77&98). The
second picture is of the oil-immersed KR-4, 16” (40cms) long, direct descendent
of the KR-3. The two kenotrons are internally similar, with an axial filament
on a spiral support inside the cylindrical anode.
No technical specifications available. |
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