A half-wave vacuum rectifier assigned a military designation or "pattern" number by the British Navy. This type of tube was also referred to as a CV1266 or a NU13A ...
Helium-filled half-wave rectifier. A 4-pin base with brass shell and ceramic insulator. Tipped S-shaped envelope. Maker's stamping on base reads: "Raytheon / Type B Patented / June 27, 1922 July 7, ...
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