with tubes only

Industry

CPC
H03F3/28

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Parent Industries

HELECTRICITY H03Electronic circuits H03FAMPLIFIERS H03F3/00Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

Current Industry

H03F3/28with tubes only

Industries

Patents Grantslast 30 patents

Information Patent Grant
Valve amplifiers
- Patent number 12,107,560
- Issue date Oct 1, 2024
- Blackstar Amplification Ltd.
- Paul James Stevens
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Audio amplifier circuit
- Patent number 10,469,042
- Issue date Nov 5, 2019
- Ralph R. Karsten
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Incremental wattage reduction in a vacuum tube amplifier
- Patent number 9,917,560
- Issue date Mar 13, 2018
- Mesa/Boogie Ltd.
- Randall Smith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Amplifier with selectable master control
- Patent number 8,766,082
- Issue date Jul 1, 2014
- Mesa/Boogie, Ltd.
- Randall C. Smith
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Method for adjusting the maximum output power of a valve power ampl...
- Patent number 8,705,772
- Issue date Apr 22, 2014
- Parsek S.r.l.
- Marco De Virgiliis
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Push-pull amplifier having inductive common mode decoupling
- Patent number 8,653,894
- Issue date Feb 18, 2014
- Siemens Aktiengesellschaft
- Oliver Heid
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Methods and apparatus for variable solid state-to-tube rectificatio...
- Patent number 8,610,498
- Issue date Dec 17, 2013
- Peavey Electronics Corporation
- Paul James Stevens
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Method and apparatus for biasing an amplifier
- Patent number 8,400,221
- Issue date Mar 19, 2013
- Fender Musical Instruments Corporation
- Charles C. Adams
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Method and apparatus for biasing an amplifier
- Patent number 7,944,302
- Issue date May 17, 2011
- Fender Musical Instruments Corporation
- Charles C. Adams
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Controlling the performance of a thermionic tube
- Patent number 7,936,211
- Issue date May 3, 2011
- KBO Dynamics International Limited
- Colin Arrowsmith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Presence control for guitar amplifier
- Patent number 7,412,064
- Issue date Aug 12, 2008
- Randall C. Smith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Power supply for guitar amplifier
- Patent number 7,193,458
- Issue date Mar 20, 2007
- Randall C. Smith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Methods and apparatus for variable harmonic distortion
- Patent number 7,145,392
- Issue date Dec 5, 2006
- Peavey Electronics Corporation
- Hartley D. Peavey
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Methods and apparatus for switching between class A and A/B operati...
- Patent number 7,053,714
- Issue date May 30, 2006
- Peavey Electronics Corporation
- John Calvin Fields
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Cathode-coupled pentode valve amplifier with servo offset controlle...
- Patent number 6,937,093
- Issue date Aug 30, 2005
- Bretza, Ltd.
- Terence D. Tekushan
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Audio signal enhancement and amplification system
- Patent number 6,792,120
- Issue date Sep 14, 2004
- Jonathan M. Szenics
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Amplifier and preamplifier circuit
- Patent number 6,242,977
- Issue date Jun 5, 2001
- Atma-Sphere Music Systems, Inc.
- Ralph R. Karsten
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Hybrid thermionic valve and solid state audio amplifier
- Patent number 6,140,870
- Issue date Oct 31, 2000
- Erick M. Cook
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Vacuum tube differential preamplifier having a transformer with a c...
- Patent number 6,111,460
- Issue date Aug 29, 2000
- Wako Technical Co., Ltd.
- Fujio Yamasita
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Amplifier for a guitar or other musical instrument
- Patent number 6,111,961
- Issue date Aug 29, 2000
- Guytron, LLC
- Guy L. Hedrick
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Continuously variable circuit for producing an output signal having...
- Patent number 5,977,474
- Issue date Nov 2, 1999
- Timothy O'Brien
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Vacuum tube audio amplifying circuit
- Patent number 5,912,585
- Issue date Jun 15, 1999
- Zanden Audio System Co., Ltd.
- Kazutoshi Yamada
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Variable control of electronic power supplies
- Patent number 5,909,145
- Issue date Jun 1, 1999
- Maven Peal Instruments, Inc.
- David G. Zimmerman
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Transformer-coupled amplifier
- Patent number 5,838,196
- Issue date Nov 17, 1998
- Yoshiki Industrial Co., Ltd.
- Yasuo Yoshizawa
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Tube type power amplifier with distortion control
- Patent number 5,668,499
- Issue date Sep 16, 1997
- Peavey Electronics Corporation
- James Robert Albert
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Variable control of electronic power supplies
- Patent number 5,635,872
- Issue date Jun 3, 1997
- Maven Peal Instruments, Inc.
- David G. Zimmerman
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Transformerless output vacuum tube audio amplifier
- Patent number 5,604,461
- Issue date Feb 18, 1997
- Bruce M. Rozenblit
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Vacuum tube amplifier with selectable power devices
- Patent number 5,559,469
- Issue date Sep 24, 1996
- Randall C. Smith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Output power selection apparatus for a tube-type audio amplifier
- Patent number 5,550,509
- Issue date Aug 27, 1996
- Salvatore J. Trentino
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Grant
Output tube bias selection apparatus for tone alteration in a tube-...
- Patent number 5,546,046
- Issue date Aug 13, 1996
- Salvatore J. Trentino
- H03 - BASIC ELECTRONIC CIRCUITRY

Patents Applicationslast 30 patents

Information Patent Application
TUBE AMPLIFIER
- Publication number 20240072742
- Publication date Feb 29, 2024
- Stewart Lovece
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
VALVE AMPLIFIERS
- Publication number 20220385253
- Publication date Dec 1, 2022
- Blackstar Amplification Ltd.
- Paul James Stevens
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Application
AUDIO AMPLIFIER CIRCUIT
- Publication number 20190348957
- Publication date Nov 14, 2019
- Ralph R. Karsten
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Programmable Vacuum Tube Bias Control
- Publication number 20150280667
- Publication date Oct 1, 2015
- Norman George Matthews
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
PUSH-PULL AMPLIFIER HAVING INDUCTIVE COMMON MODE DECOUPLING
- Publication number 20120313707
- Publication date Dec 13, 2012
- Oliver Heid
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Amplifier with selectable master control
- Publication number 20120152089
- Publication date Jun 21, 2012
- Randall C. Smith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Method for adjusting the maximum output power of a valve power ampl...
- Publication number 20110311076
- Publication date Dec 22, 2011
- PARSEK S.r.l.
- Marco De Virgiliis
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Controlling the Performance of a Thermionic tube
- Publication number 20110199155
- Publication date Aug 18, 2011
- Colin Arowsmith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Methods And Apparatus For Variable Solid State-To-Tube Rectificatio...
- Publication number 20110170716
- Publication date Jul 14, 2011
- Peavey Electronics Corporation
- Paul James Stevens
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Method and Apparaus for Biasing an Amplifier
- Publication number 20110135116
- Publication date Jun 9, 2011
- Fender Musical Instruments Corporation
- Charles C. Adams
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
METHOD AND APPARATUS FOR BIASING AN AMPLIFIER
- Publication number 20110043278
- Publication date Feb 24, 2011
- Fender Musical Instruments Corporation
- Charles C. Adams
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Controlling the performance of a thermionic tube
- Publication number 20100033245
- Publication date Feb 11, 2010
- Colin Arrowsmith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Methods and apparatus for variable harmonic distortion
- Publication number 20060012424
- Publication date Jan 19, 2006
- Hartley D. Peavey
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Cathode-coupled pentode valve amplifier with servo offset controlle...
- Publication number 20040140850
- Publication date Jul 22, 2004
- Bretza, Ltd.
- Terence D. Tekushan
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Presence control for guitar amplifier
- Publication number 20030179893
- Publication date Sep 25, 2003
- Randall C. Smith
- H03 - BASIC ELECTRONIC CIRCUITRY
Information Patent Application
Power supply for guitar amplifier
- Publication number 20030169106
- Publication date Sep 11, 2003
- Randall C. Smith
- H03 - BASIC ELECTRONIC CIRCUITRY

with tubes only

Industry

Parent Industries

Current Industry

Patents Grantslast 30 patents

Valve amplifiers

Audio amplifier circuit

Incremental wattage reduction in a vacuum tube amplifier

Amplifier with selectable master control

Method for adjusting the maximum output power of a valve power ampl...

Push-pull amplifier having inductive common mode decoupling

Methods and apparatus for variable solid state-to-tube rectificatio...

Method and apparatus for biasing an amplifier

Method and apparatus for biasing an amplifier

Controlling the performance of a thermionic tube

Presence control for guitar amplifier

Power supply for guitar amplifier

Methods and apparatus for variable harmonic distortion

Methods and apparatus for switching between class A and A/B operati...

Cathode-coupled pentode valve amplifier with servo offset controlle...

Audio signal enhancement and amplification system

Amplifier and preamplifier circuit

Hybrid thermionic valve and solid state audio amplifier

Vacuum tube differential preamplifier having a transformer with a c...

Amplifier for a guitar or other musical instrument

Continuously variable circuit for producing an output signal having...

Vacuum tube audio amplifying circuit

Variable control of electronic power supplies

Transformer-coupled amplifier

Tube type power amplifier with distortion control

Variable control of electronic power supplies

Transformerless output vacuum tube audio amplifier

Vacuum tube amplifier with selectable power devices

Output power selection apparatus for a tube-type audio amplifier

Output tube bias selection apparatus for tone alteration in a tube-...

Patents Applicationslast 30 patents

TUBE AMPLIFIER

VALVE AMPLIFIERS

AUDIO AMPLIFIER CIRCUIT

Programmable Vacuum Tube Bias Control

PUSH-PULL AMPLIFIER HAVING INDUCTIVE COMMON MODE DECOUPLING

Amplifier with selectable master control

Method for adjusting the maximum output power of a valve power ampl...

Controlling the Performance of a Thermionic tube

Methods And Apparatus For Variable Solid State-To-Tube Rectificatio...

Method and Apparaus for Biasing an Amplifier

METHOD AND APPARATUS FOR BIASING AN AMPLIFIER

Controlling the performance of a thermionic tube

Methods and apparatus for variable harmonic distortion

Cathode-coupled pentode valve amplifier with servo offset controlle...

Presence control for guitar amplifier

Power supply for guitar amplifier