.~.~ Filamentary cathodes heated by anode current or anode supply source
DEFINITION
Classification: 330/201
(under subclass 200) Subject matter where the filamentary cathodes of at least one vacuum tube amplifying device of the plural stage amplifier derives its electrical heating supply either from the anode or anode power supply of one vacuum tube amplifying device stage of the plural stage amplifier.
SEE OR SEARCH THIS CLASS, SUBCLASS:
115, for amplifiers having unrectified A.C. power supplied to a filamentary cathode (directly heated type).
205, for similar subject matter for a filamentary cathode also involving power supply or bias means for an input electrode.
206, for power supply or bias means applied to a filamentary cathode (directly heated type), generally.
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.
