Development of a Versatile Linear Gridded-Tube/Cavity UHF Power Amplifier
Semi-annual rept. 1 Oct 1973-1 Apr 1974
VARIAN ASSOCIATES INC SAN CARLOS CA EIMAC DIV
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Five EIMAC type 8938 or modifications thereof were fabricated and tested over the frequency range 225 to 400 MHz. Tube modifications included a application of a special high temperature prograde grid coating, b application of high conductivity materials to critical parts of the tube configuration in order to reduce RF losses and provide improved thermal management, c the application of a coated particle cathode emitter material. Two different tunable cavities were fabricated during this period. The first, a narrow band cavity, was built in order to evaluate comparative performance of tubes 8938 and the modifications applied to those tubes. The other tunable cavity is a double-tuned iris coupled configuration and is the prototype wide band cavity for this program.
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