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Class Information
Number: 330/3
Name: Amplifiers > With plural diverse-type amplifying devices
Description: Subject matter including at least two amplifying devices each of which is of a type different from the other.










Patents under this class:

Patent Number Title Of Patent Date Issued
8335326 Communication method for vacuum tube replacement devices Dec. 18, 2012
8160275 Apparatus and method for an integrated, multi-mode, multi-band, and multi-stage power amplifier Apr. 17, 2012
7482863 Expanded performance and functions for vacuum tube replacement devices Jan. 27, 2009
7408401 Vacuum tube replacement device, circuit and system Aug. 5, 2008
6937093 Cathode-coupled pentode valve amplifier with servo offset controlled push-pull output stage Aug. 30, 2005
6903593 Gain amplifier with DC offset cancellation circuit Jun. 7, 2005
6737915 Tube input JFET output (TIJO) zero feedback audio amplifier May. 18, 2004
6724523 Remotely locatable RF power amplification system Apr. 20, 2004
6590450 System and method for linearizing vacuum electronic amplification Jul. 8, 2003
6507240 Hybrid audio amplifier Jan. 14, 2003
6356147 Wideband dual amplifier circuits Mar. 12, 2002
6229387 Output signal converter for ampliciation or attenuation of tube amplifier output while maintaining output properties May. 8, 2001
6175271 Output signal converter for tube amplifiers Jan. 16, 2001
6140870 Hybrid thermionic valve and solid state audio amplifier Oct. 31, 2000
6112249 Non-disruptively rerouting network communications from a secondary network path to a primary path Aug. 29, 2000
5912585 Vacuum tube audio amplifying circuit Jun. 15, 1999
5793252 Power amplifier with switchable voicing elements Aug. 11, 1998
5705950 Hybrid solid state/vacuum tube audio amplifier Jan. 6, 1998
5450034 Reflected plate amplifier Sep. 12, 1995
5343159 Direct box employing hybrid vacuum tube and solid state circuitry Aug. 30, 1994
5302912 Push-pull audio amplifier with crossover distortion compensation Apr. 12, 1994
5268648 Field emitting drain field effect transistor Dec. 7, 1993
5148116 Enhanced vacuum tube power amplifier Sep. 15, 1992
5017884 Vacuum tube and MOSFET transimpedance amplifier May. 21, 1991
4918394 Audio frequency power amplifier with improved circuit topology Apr. 17, 1990
4523152 High-efficiency feedforward-error-correction amplifier Jun. 11, 1985
4516080 High-efficiency low distortion parallel amplifier May. 7, 1985
4485349 Stabilized microwave power amplifier system Nov. 27, 1984
4324950 Amplifier for driving electrostatic loudspeakers Apr. 13, 1982
4163198 Audio amplifier Jul. 31, 1979
3995226 Audio amplifier Nov. 30, 1976











 
 
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