OXIDE CATHODE AND PRIMARY GRID EMISSION STUDIES.
Monthly rept. no. 24 for Apr 49,
WESTINGHOUSE ELECTRIC CORP BLOOMFIELD NJ LAMP DIV
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Correlation was sought between gas pressure and electrical breakdown in 715 type tubes. Several methods of liberating gas in sealed-off 5D21 tubes were tried and r.f. heating of the anode proved the most successful. An increase in gas pressure resulted which did not decrease with time. Gas released from the anode when on high voltage operation gradually disappeared after such operation. An increased number of breakdowns resulted after r.f. heating of the anode but it was not possible to attribute this entirely to the gas released. A new tube for thermionic emission measurements has been constructed to replace the old one which developed a leak. Preliminary experiments have been made on the emission from a tungsten filament coated with titanium carbide. The thermal emissivity of this material changes with heat treatment. The material is also very difficult to outgas. Author