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Class Information
Number: 330/50
Name: Amplifiers > With dummy tube
Description: Subject matter including in addition to the amplifying device of the vacuum tube type, a similar vacuum tube, with the cathode unheated, so that the additional tube does not serve as an active element but merely presents impedance relations in the circuit similar to those of the amplifying device vacuum tube, usually for neutralizing the effects of the amplifying device interelectrode impedances.

Patents under this class:

Patent Number Title Of Patent Date Issued
8284953 Circuit and method of reducing pop-up noise in a digital amplifier Oct. 9, 2012
7046081 Amplifier circuit with passive gain step circuit May. 16, 2006
6564062 Pilot search to determine processor loading May. 13, 2003

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