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Class Information
Number: 330/70
Name: Amplifiers > Anode energized through discharge path of controlled vacuum tube
Description: Subject matter including at least two amplifying devices of the vacuum tube type, each having at least three electrodes including a control grid electrode, wherein at least a portion of the anode-cathode power supply current, for one of the amplifying devices, flows in series from the power supply source through the space discharge path of the other amplifying device, so that the tubes are series energized (at least in part) from the power supply.

Sub-classes under this class:

Class Number Class Name Patents
330/71 Plural discharge paths traversed by anode supply 4
330/73 Plural outputs 2
330/74 Separate signal inputs to series devices 0

Patents under this class:

Patent Number Title Of Patent Date Issued
8542848 Musical instrument preamplifier Sep. 24, 2013
7053710 Vacuum tube amplifier having grid as output and plate as input May. 30, 2006
5880632 Tube amplifier having special configuration with two or more tubes Mar. 9, 1999
5680074 Tube amplifier having specific configuration with four tubes Oct. 21, 1997
5030921 Cascaded cold cathode field emission devices Jul. 9, 1991
4163198 Audio amplifier Jul. 31, 1979
3999139 Monolithic alternately stacked IF amplifier Dec. 21, 1976

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