PRODUCTION ENGINEERING MEASURE FOR TYPE 7890 SUPER POWER HYDROGEN THYRATRON.
Quarterly progress rept. no. 9, 8 Mar-7 Jun 64,
TUNG-SOL ELECTRIC INC LIVINGSTON N J CHATHAM ELECTRONICS DIV
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Initial tests have shown that the tube design used for four tubes meets the specification requirements including the added requirement of 30 amperes maximum cathode heater current. The use of fins to dissipate heat from the external grid rings has prevented the occurrence of deterimental primary grid emission during the aging of the tube. Changing the grid overlap from 0.160 inches to 0.190 inches made no difference in the firing characteristics. The greater overlap will provide a better design for production because minor misalignments between the grids will not be critical. Author