Sensibly equivalent¶ to:
4B30 CV934 FT-15R
The 15R is a matching rectifier for the 15E UHF pulse Radar triode. Eimac designed the valves in 1940 for the first American airborne Radar.
The peak current required by the triodes could reach 20 Amps and the figure of 30 mA is the average value. The peak pulse power was 5 kW at a repetition rate of 400 Hz and a duration of 2 μS The Va figure above is the PIV rating.
The device is marked US Navy and was used in 1941 ABS-1 radar initially. The filament is a helix of bright thoriated tungsten running vertically within the bell like anode cavity. The manufacture is the same as the triode but without the grid cage and the anode taken to the top pin.
The wide glass tube envelope is 34 mm in diameter and, is 70 mm tip-to-tip.
Reference: Private communication. Type 15R was first introduced in 1940. See also 1940 adverts.
Absolute Maximum Operating Conditions¶
Updated August 23, 2013.