Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Automatic cut-out or voltage regulator in the cathode or...
Patent
1980-04-02
1981-05-12
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Automatic cut-out or voltage regulator in the cathode or...
315141, 315307, 328270, G05F 164
Patent
active
042674875
ABSTRACT:
A high power tube in applications requiring reduced AC hum in the amplified signal, utilizes a direct current heated filament. In order to reduce the incidence of tube failure and maintain a stable mode of operation, the direct current is produced by a regulated source of DC voltage. The regulated source includes a transformer having a primary winding coupled to a source of alternating line voltage and also includes a secondary winding at which a transformed low voltage is generated. A rectifier is coupled to the secondary winding for rectifying the transformed voltage to produce a pulsating direct voltage which is applied to the tube filament by a filter. The primary winding of the transformer is coupled to the AC source by means of a saturable reactor. A control circuit senses the voltage across the filament and controls the reactor in a feedback manner.
REFERENCES:
patent: 3022458 (1962-02-01), Sola
patent: 3078388 (1963-02-01), Hanks et al.
patent: 3517253 (1970-06-01), Dietz
patent: 3767960 (1973-10-01), Ahrens
patent: 3895256 (1975-07-01), Reh et al.
patent: 3914653 (1975-10-01), Forster et al.
Shibler William
Unetich Robert M.
LaRoche Eugene R.
Meise William H.
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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