Final Technical Report, 29 April 1958-31 December 1959.
SYLVANIA ELECTRIC PRODUCTS INC EMPORIUM PA
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Pilot line production work on ceramic envelope, Type SN-2358C, was preceded by a design evaluation of the identical structure sealed in a glass envelope. Ceramic to metal active alloy sealing was investigated because of the apparently inherent ability of the NiTi seal to form microscopic cracks a workable solution was obtained. Exhaust and processing techniques were improved by design of a resistance heating system capable of processing and sealing several tubes simultaneously. Environmental testing and evaluation of Type SN-2358C indicated that the design is capable of surviving 400 C temperatures for extended periods. Improvements in structure resulted in a tube which was approaching 100 yield after 750G shock tests. Sweep frequency vibration fatigue tests resulted in early failure of the tubes in most cases. Evaluation of Type SN-2358C in a severe dc amplifier application indicated that the tube should compete with many existing premium glass triodes. Author