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Class Information
Number: 330/139
Name: Amplifiers > With control of power supply or bias voltage > With control of input electrode or gain control electrode bias > Electronic tube controls bias
Description: Subject matter wherein "the bias voltage control means" includes an electronic tube to control the bias voltage which tube may be a gas tube or vacuum tube having a means for control thereof while the tube is in operation.

Patents under this class:

Patent Number Title Of Patent Date Issued
6642783 Amplification device with optimized linearity Nov. 4, 2003
5838194 Constant settling time automatic gain control circuits Nov. 17, 1998
5652547 Current comparator automatic output control Jul. 29, 1997
5434539 Unity-gain linear-fader control for VCA Jul. 18, 1995
5424679 +12dB gain linear-fader control for VCA Jun. 13, 1995
4210882 Delay network comprising a chain of all-pass sections Jul. 1, 1980
4048573 Amplifier improvements for limiting clipping Sep. 13, 1977
4037163 Automatic gain control circuit Jul. 19, 1977
4024463 A.C. amplifier automatic gain control fast attack circuit May. 17, 1977
4007428 Automatic gain control of pulses Feb. 8, 1977
4001694 Automatic gain control circuit arrangements having a plurality of stages of amplification Jan. 4, 1977
3967209 Discriminating sonic detection system Jun. 29, 1976

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