Long-Life Grid-Controlled Amplifier.
Triannual rept. no. 1, 15 May-15 Sep 69,
GENERAL ELECTRIC CO SCHENECTADY NY
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The purpose of the research program is to develop a long-life grid-controlled amplifier. A titanium-ceramic envelope is used to provide a high vacuum environment for the thermionic emitter. Refractory materials are to be used to support the cathode and eliminate sources of sublimation. The grid is to be bonded to the cathode so as to achieve a high degree of reliability. The most promising approach to achieve a bonded grid appears to be chemical deposition of a form of isotropic boron nitride on a porous cathode disk, then depositing a metallic layer over the nitride, and finally forming the grid pattern in the nitride-metal layers. High-temperature processing of this structure prior to cathode impregnation can reduce its gas content and contribute to long life. Author
- Electrical and Electronic Equipment