H03F 5 - Amplifiers with both discharge tubes and semiconductor devices as amplifying elements

Patents for H03F 5 - Amplifiers with both discharge tubes and semiconductor devices as amplifying elements (49)
09/2014
09/23/2014	US8841966 Sound output device using vacuum tube, audio apparatus and method for sound output thereof
06/2014
06/25/2014	EP2747280A1 Electronic device and control method thereof
06/05/2014	DE102012023745A1 Schaltungsanordnung zur Verbesserung von Lautsprecherwiedergabe Circuit arrangement for improving loudspeaker reproduction
01/2013
01/30/2013	EP2552019A1 Sound output device using vacuum tube, audio apparatus and method for sound output thereof
10/2011
10/27/2011	DE202011004832U1 Hochspannungsverstärker mit Abgleichmöglichkeit des Eingangsstromes High voltage amplifier with matching possibility of the input current
04/2010
04/20/2010	US7702119 Multi-input gain control circuit
12/2009
12/15/2009	US7634198 In-line distortion cancellation circuits for linearization of electronic and optical signals with phase and frequency adjustment
09/2009
09/10/2009	US20090224826 Output circuit of vacuum-tube amplifier
09/10/2009	US20090224825 Output circuit of vacuum-tube amplifier
01/2009
01/27/2009	US7482863 Expanded performance and functions for vacuum tube replacement devices
08/2008
08/28/2008	US20080204131 Vacuum tube replacement device, circuit and system
08/05/2008	US7408401 Vacuum tube replacement device, circuit and system
12/2006
12/13/2006	EP1732212A1 Output signal converter for tube amplifiers
02/2006
02/14/2006	US6999826 Apparatus and method for improved PC audio quality
07/2005
07/21/2005	DE10360347A1 Symmetrischer Gegentaktverstärker Symmetrical push-pull amplifier
06/2005
06/29/2005	EP1548934A1 Fully differential push-pull amplifier
12/2004
12/30/2004	DE10326581A1 Device for emulating acoustic characteristics of valve power amplifiers e.g. for electric guitar, is provided with discrete modules for emulation of acoustic characteristics
05/2004
05/18/2004	US6737915 Tube input JFET output (TIJO) zero feedback audio amplifier
05/13/2004	US20040090263 Tube input jfet output (tijo) zero feedback audio amplifier
12/2003
12/17/2003	EP1372260A2 Output signal converter for tube amplifiers
09/2002
09/12/2002	US20020126861 Audio expander
05/2001
05/08/2001	US6229387 Output signal converter for ampliciation or attenuation of tube amplifier output while maintaining output properties
01/2001
01/16/2001	US6175271 Output signal converter for tube amplifiers
06/1999
06/16/1999	EP0923194A2 Output signal converter for tube amplifiers
06/15/1999	US5912585 Vacuum tube audio amplifying circuit
06/01/1999	US5909145 Variable control of electronic power supplies
09/1998
09/06/1998	CA2199348A1 Asymmetrical driver for asymmetrical loudspeakers
02/1998
02/24/1998	US5721784 Asymmetrical driver for asymmetrical loudspeakers
01/1998
01/06/1998	US5705950 Hybrid solid state/vacuum tube audio amplifier
08/1997
08/21/1997	WO1997030514A1 Hybrid solid state/vacuum tube audio amplifier
06/1997
06/03/1997	US5635872 Variable control of electronic power supplies
05/1997
05/22/1997	WO1997018627A1 Variable control of electronic power supplies
05/21/1997	CN2254610Y Large power audio power amplifier
03/1997
03/18/1997	US5612646 Output transformerless amplifier impedance matching apparatus
09/1995
09/12/1995	US5450034 Reflected plate amplifier
08/1994
08/30/1994	US5343159 Direct box employing hybrid vacuum tube and solid state circuitry
11/1992
11/03/1992	CA1309756C Audio frequency power amplifier with improved circuit topology
09/1992
09/15/1992	US5148116 Enhanced vacuum tube power amplifier
06/1992
06/30/1992	US5127059 Audio amplifiers
05/1991
05/21/1991	US5017884 Vacuum tube and MOSFET transimpedance amplifier
04/1990
04/17/1990	US4918394 Audio frequency power amplifier with improved circuit topology
01/1985
01/22/1985	US4495640 Adjustable distortion guitar amplifier
04/1982
04/13/1982	US4324950 Amplifier for driving electrostatic loudspeakers
04/13/1982	CA1121735A1 Dual mode music instrument amplifier
04/1981
04/21/1981	US4263531 Electron beam-semiconductor diode hybrid device for phase control
07/1980
07/08/1980	US4211893 Dual mode music instrument amplifier
04/1977
04/12/1977	US4017805 Compensated electron beam deflection device
11/1976
11/30/1976	US3995226 Audio amplifier
05/1976
05/25/1976	US3959734 Electron-beam-bombarded, semiconductor, traveling-wave device