(under subclass 199) Subject matter wherein the "source of electrical energy", biasing means, the circuit or means for supplying such electrical energy or bias voltage, or isolating means for such source or bias means supplies the anode of a vacuum tube amplifying device or isolates such supply for the anode from other parts of the amplifier.
SEE OR SEARCH THIS CLASS, SUBCLASS:
70+, for series energized amplifiers.
128, for control of bias or power supply voltage with control means in anode or screen grid circuit.
157+, 185+ and 192+, appropriate subclasses thereunder for impedances from the power source to anode involved in interstage, input, and output coupling respectively.
293+, for series energized semiconductor amplifying devices.
