Fast warm-up cathode for high power vacuum tubes

Details Fast warm-up cathode for high power vacuum tubes Fast warm-up cathode for high power vacuum tubes

1989-01-23

1991-05-14

Yusko, Donald J.

Electric lamp and discharge devices

With temperature modifier

For filament or heated cathode

313270, 313346R, 445 35, 445 46, 445 51, H01J 115

Patent

active

050159089

ABSTRACT:
In order to bring a high power vacuum tube to full power in a few seconds, it is necessary to heat the cathode quickly to 1100.degree. C. In large tubes, prior art structures cannot be simply enlarged. A novel cathode structure in which the heater element is anisotropic pyrolytic graphite coated with anisotropic pyrolytic boron nitride for insulation and then sintered to the cathode avoids these problems.

REFERENCES:
patent: 2996643 (1961-08-01), Johnstone et al.
patent: 3299317 (1967-01-01), Kendall, Jr.
patent: 3671792 (1972-06-01), Waltermire
patent: 4096406 (1978-06-01), Miram
patent: 4220889 (1980-09-01), Marhic et al.
patent: 4263528 (1981-04-01), Miram
patent: 4675573 (1987-06-01), Miram et al.

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