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Class Information
Number: 330/206
Name: Amplifiers > With power or bias voltage supply > For filamentary cathode
Description: 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.

Patents under this class:

Patent Number Title Of Patent Date Issued
6194774 Inductor including bonding wires Feb. 27, 2001
4324950 Amplifier for driving electrostatic loudspeakers Apr. 13, 1982
4290027 Fail-safe active bandpass filter using a modified twin-T filter Sep. 15, 1981

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