US PATENT SUBCLASS 330 / 206
.~ For filamentary cathode


Current as of: June, 1999
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330 /   HD   AMPLIFIERS

199  DF  WITH POWER OR BIAS VOLTAGE SUPPLY {4}
206.~ For filamentary cathode


DEFINITION

Classification: 330/206

(under subclass 199) Subject matter which may include the heater current supply for a filamentary cathode of a vacuum tube amplifying device not classified in any preceding subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

115, for amplifiers having unrectified A.C. power supplied to a filamentary cathode.

127, for control of emission of a cathode electrode.

201, for power supply bias means for cathode filaments in a plural stage amplifier heated by the anode current or by current from the anode supply source.

205, for similar subject matter for a filamentary cathode also involving power supply or bias means for an input

electrode. SEE OR SEARCH CLASS

315, Electric Lamp and Discharge Devices: Systems,

94+, for power supply or power supply circuit for cathode filament or cathode heater circuit with or without anode supply but not including grid biasing supply.