Class 330/3 - WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES

Subclass of Class 330 - Amplifiers
Definition: Subject matter including at least two amplifying devices
No. of patents: 35
Last issue date: 01/27/2009

Number	Title	Issue Date
7482863	Expanded performance and functions for vacuum tube replacement devices Methods are provided for solid-state implementation of a vacuum tube replacement device that supplements the functional performance of the target replacement device, i.e., a traditional glass vacuum tube. Example functions may include OEM or user adjustable paramete...	01/27/2009
7408401	Vacuum tube replacement device, circuit and system A system is provided for a solid-state implementation of a vacuum tube replacement device. The system may derive power from a target amplifier filament supply. The system may include active or passive functions for noise reduction, voltage isolation, servo biasing, ...	08/05/2008
7355475	Output circuit of vacuum-tube amplifier An output circuit of a vacuum-tube amplifier is disclosed. An output circuit of a conventional vacuum-tube amplifier has shortcomings that a front end amplification unit uses a coupling condenser or a transformer to output an AC signal to an output node, a bias volt...	04/08/2008
7286060	Indicators for vacuum tube replacement devices A vacuum tube replacement device includes an indicator. The indicator can be arranged to provide audible and/or visual indication of system performance, function, status, or any other desired indication. The vacuum tube replacement device is pin-for-pin compatible w...	10/23/2007
7213457	Solid state illuminator for bi-color ported water level gauges A solid state illuminator and display are provided for bi-colored ported water level gauges suitable for use in high pressure steam drums or similar water/steam devices to facilitate making an accurate determination of water level in such devices. The illuminator in...	05/08/2007
7197926	Solid state illuminator for bi-color ported water level gauges A solid state illuminator and display means are provided for bi-coloured ported water level gauges suitable for use in high pressure steam drums or similar water/steam devices to facilitate making an accurate determination of water level in such a device. The illumi...	04/03/2007
7046814	Impedance adapter preamplifier device for electronic tube audio frequencies able to be inserted on line on the path of the low frequency signal The invention concerns an online low frequency amplifying interface operating in automatic cutting feed, particularly designed for multimedia computers. It concerns a impedance adapting device produced around an electronic tube. It can be arranged between a source t...	05/16/2006
6938477	Solid state illuminator for bi-colored ported water level gauges A solid state illuminator and display means are provided for bi-colored ported water level gauges suitable for use in high pressure steam drums or similar water/steam devices to facilitate making an accurate determination of water level in such a device. The illumin...	09/06/2005
6937093	Cathode-coupled pentode valve amplifier with servo offset controlled push-pull output stage An amplifier is described including a pair of cathode-coupled pentode vacuum tubes. A first pentode of the pair includes a control grid configured to receive an input signal. A second pentode of the pair includes a control grid configured to be coupled to an input r...	08/30/2005
6903593	Gain amplifier with DC offset cancellation circuit A DC offset cancellation circuit employs multiple feedback factors for canceling DC offset by increasing convergence time. The DC offset cancellation circuit features an active low-pass analogue filter including a variable resistor, an amplifier, a capacitor pair an...	06/07/2005
6737915	Tube input JFET output (TIJO) zero feedback audio amplifier A hybrid preamplifier with a vacuum tube input stage driving a JFET output stage dubbed TIJO (for Tube Input JFET Output) that uses zero feedback circuitry and a common low voltage B+ power supply. A single output low voltage transformer provides all necessary volta...	05/18/2004
6724523	Remotely locatable RF power amplification system A RF amplification system which includes a RF modulation unit fed by an optical carrier and an RF input signal, the modulation unit modulating the RF input signal onto the optical carrier to produce a modulated RF optical signal; an array of optical amplifiers coupl...	04/20/2004
6590450	System and method for linearizing vacuum electronic amplification An amplifier system including a vacuum tube amplifier having an input signal terminal, an output signal terminal, and an electron source, and a control circuit having an input terminal coupled to one of the input signal terminal and the output signal term...	07/08/2003
6507240	Hybrid audio amplifier A musical amplifier that includes a vacuum tube and a transistor. The vacuum tube is connected to the gate of the transistor, so that the current flow through the transistor is controlled by the vacuum tube. According to one example of the invention, the ...	01/14/2003
6356147	Wideband dual amplifier circuits Dual amplifying circuits having a magnetic tunnel junction device and a field effect transistor configured in a complementing set are disclosed herein. In one embodiment, the field effect transistor is operable to control a current level of a current oper...	03/12/2002
6229387	Output signal converter for ampliciation or attenuation of tube amplifier output while maintaining output properties The output signal converter for a tube amplifier includes semiconductor devices for amplifying or attenuating an output signal of the tube amplifier while maintaining the output properties of the tube amplifier. The output signal converter according to on...	05/08/2001
6175271	Output signal converter for tube amplifiers The output signal converter for a tube amplifier includes semiconductor devices for amplifying or attenuating an output signal of the tube amplifier while maintaining output properties of the tube amplifier. The output signal converter in preferred embodi...	01/16/2001
6140870	Hybrid thermionic valve and solid state audio amplifier A hybrid thermionic valve and solid state audio amplifier. A complete tube amplifier is scaled to produce a relatively low power yet also retain its small and large signal distortion characteristics. The output of the scaled amplifier is amplified by a re...	10/31/2000
6112249	Non-disruptively rerouting network communications from a secondary network path to a primary path Methods, systems and computer program products for the reassignment of communications sessions to a primary network communications path from a secondary network communications path are provided, which detect the availability of the primary network communi...	08/29/2000
5912585	Vacuum tube audio amplifying circuit In a direct coupled type vacuum tube amplifying circuit, to stabilize the operation and simplify the feedback loop, a plate power source EB5 is connected to a plate of a vacuum tube V5 of a first stage through a constant current source 1. A grid of a vacu...	06/15/1999
5793252	Power amplifier with switchable voicing elements An electronic amplifying apparatus for sound reproduction and musical instrument amplification including at least two pairs of power output devices which are independently switchable between triode and pentode operation. The amplifier further contains a s...	08/11/1998
5705950	Hybrid solid state/vacuum tube audio amplifier In this hybrid amplifier circuit the vacuum tube is direct coupled or DC coupled to the output of a solid state amplifier in a cathode follower configuration. An automatically operative bypass component, such as a Zener diode, LED, transistor junction or ...	01/06/1998
5450034	Reflected plate amplifier A reflected plate amplifier (RPA) for use with electronic audio equipment. The RPA comprises an input circuit for receiving an input signal, a vacuum tube, a plate current reflector, and an output circuit for delivering an output signal. The vacuum tube h...	09/12/1995
5343159	Direct box employing hybrid vacuum tube and solid state circuitry The direct coupled solid state-vacuum tube hybrid circuit matches a high impedance audio source to a low impedance audio destination. The resulting device supplies essentially unit gain and has both single ended and balanced outputs. The solid state opera...	08/30/1994
5302912	Push-pull audio amplifier with crossover distortion compensation A high-performance, distortion-free, audio push-pull amplifier has a class A driver stage that drives a class B push-pull output stage that is coupled to a load through a transformer that has a center tap primary with screen taps. The driver tube cathodes...	04/12/1994
5268648	Field emitting drain field effect transistor A field emitting drain field effect transistor FEDFET device which combines the desirable frequency response and current control characteristics of a field effect transistor (or other transistor) with the higher voltage higher power level characteristics ...	12/07/1993
5148116	Enhanced vacuum tube power amplifier An audio power amplifier for general audio and sound reinforcement use, or musical amplification, stringed or otherwise, which combines the sonic properties of vacuum tube amplification with the modern technology of solid state electronics, with its atten...	09/15/1992
5017884	Vacuum tube and MOSFET transimpedance amplifier An improved transimpedance amplifier includes a common cathode-connected vacuum tube first stage, coupled to a common-drain-connected MOSFET second stage, and an optional common drain-connected MOSFET third stage. Preferably, capacitive feedback is couple...	05/21/1991
4918394	Audio frequency power amplifier with improved circuit topology The present invention is an audio frequency power amplifier input circuit having improved vacuum tube circuit topology. The improved circuit includes a direct current feedback circuit within the input circuitry which stabilizes the operating point of a ph...	04/17/1990
4523152	High-efficiency feedforward-error-correction amplifier The present invention relates to a feedforward-error-correction amplifier system comprising a switching circuit, a linear-amplification means, and a summing network, wherein an amplifier-system input signal is connected to a first input port of the linear...	06/11/1985
4516080	High-efficiency low distortion parallel amplifier A high-efficiency low-distortion parallel amplifier or regulator is driven by an input signal source Vi. An input signal passes to a linear circuit LC, and the output current i1 from the linear circuit passes to the input of a switch...	05/07/1985
4485349	Stabilized microwave power amplifier system A power amplifier including a klystron is stabilized against variations in output power with a simplified servo-loop system and cooperating temperature compensation. The system is fully solid-state, digital, and includes an operator-presettable initial po...	11/27/1984
4324950	Amplifier for driving electrostatic loudspeakers An amplifier for a capacitive load which includes a pair of high-voltage tube output circuits connected in a power output tube arrangement operating in push-pull for driving a capacitive load together with a feedback network connected between the Schmitt ...	04/13/1982
4163198	Audio amplifier An audio amplifier including a non-inverting amplifier stage that provides linear amplification without loop feedback for low distortion audio systems. The amplifier stage includes a triode vacuum tube or a triode connected pentode vacuum tube and a P cha...	07/31/1979
3995226	Audio amplifier An audio amplifier in which an output stage is coupled by a driver stage to an input stage which includes two antiphased sources of alternating current. The output stage includes two pentode vacuum tubes each having a cathode, a plate and a screen grid lo...	11/30/1976

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Class 330/3 - WITH PLURAL DIVERSE-TYPE AMPLIFYING DEVICES