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| Number | Title | Issue Date |
| 7193458 | Power supply for guitar amplifier A power supply for a guitar amplifier and the guitar amplifier and method of operating the guitar amplifier. The power supply includes an alternating current power input having a secondary winding and a filament winding, an output and a first vacuum tube rectifier c... | 03/20/2007 |
| 6956430 | Distortion detector A distortion detector comprises a clip detector to generate a distortion pulse, processing means to calculate the duty cycle of the distortion pulse and comparator means for supplying a control signal when the calculated duty cycle exceeds a certain threshold value.... | 10/18/2005 |
| 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 |
| 6621335 | Class D amplifier with passive RC network A Class D amplifier device with reduced power consumption uses a passive RC network. The output of the RC network directly feeds a comparator resulting in increased efficiency. The RC network is configured to perform several functions, including the low p... | 09/16/2003 |
| 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 |
| 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 |
| 5872512 | Apparatus and method for reducing errors in a battery operated sensing circuit An apparatus and method for reducing errors in a battery powered sensing circuit uses two pull-up resistors. The first resistor has a value selected to minimize battery drain and the second resistor has a value selected to reduce dendrite or other parasit... | 02/16/1999 |
| 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 |
| 5668499 | Tube type power amplifier with distortion control A power amplifier has a distortion control circuit responsive to a clipping detector for loading said amplifier input with a signal sufficient to reduce the input to the tube grids to a level below clipping.... | 09/16/1997 |
| 5572099 | Motor speed control with current limit A phase-locked loop (or frequency-locked loop) based circuit for controlling the drive applied to a DC polyphase motor is disclosed. The disclosed circuit includes a clamp circuit, connected to the input of the motor drive amplifier, for limiting the curr... | 11/05/1996 |
| 5498996 | High-power, high-fidelity tube amplifier A high-power, high-fidelity tube amplifier which includes a plurality of output tubes connected in parallel with individual current sinks and a plurality of parasitic suppression components. Each current sink is electrically coupled to its corresponding o... | 03/12/1996 |
| 5363056 | Circuit for linearization of amplified electronic signals An electronic circuit provides a linear output from an amplifying device, such as a hybrid push-pull amplifier, which has inherent distortion. In a preferred embodiment, the distortion of the hybrid amplifier is compensated by nesting a pair of hybrid pus... | 11/08/1994 |
| 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 |
| 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 |
| 4797628 | Distributed push-pull amplifier The present invention provides a modified distributed amplifier which is capable of providing push-pull operation without the loading losses of conventional push-pull combining. The modified distributed amplifier comprises a distributed amplifier configur... | 01/10/1989 |
| 4751472 | High frequency amplifier The invention relates to a high frequency amplifier for coupling a load with a tetrode which is used as the amplifier tube and which is provided with a regulating circuit with a set point adjuster for the anode voltage. The regulating circuit can also be ... | 06/14/1988 |
| 4713624 | Power amplifier with modified dynamic response A vacuum tube amplifying apparatus provides predetermined varying dynamic response characteristics in order to enhance the playing characteristics of musical instruments, especially guitar.... | 12/15/1987 |
| 4644289 | Variable power amplifier for audio frequency signals and method A variable power amplifier having a constant current differential amplifier driving a cascaded driving amplifier, a variable power amplifier including a vacuum tube for selectively amplifying output signals wherein the drive of the variable power amplifie... | 02/17/1987 |
| 4455536 | Push-pull microwave amplifier A push-pull microwave amplifier in which an input signal is split into two ransmission paths in a manner which simulates the behavior of a center-tapped transformer over a broad frequency range. The input signal is first divided into two identical paths an... | 06/19/1984 |
| 4337439 | Wide band amplifiers A distributed amplifier is provided with an output filter line with the output terminals of a plurality of individual amplifying devices connected to different points along the output filter line. Instead of dimensioning the impedance of the output filter... | 06/29/1982 |
| 4153882 | High-efficiency amplifier This invention provides a method and means for amplifying signal waves with high efficiency that comprises signal sampling means operating at the Nyquist rate or greater, sample-quantizing means, a plurality of circuits that link the quantizing means to a... | 05/08/1979 |
| 4047120 | Transient suppression circuit for push-pull switching amplifiers A protective coupling circuit is located between the D.C. supply voltage the amplifier components of a push-pull switching amplifier to suppress transients created during switching. The coupling circuit comprises a power supply filter with an inductor c... | 09/06/1977 |
| 4028633 | Drive control to prevent simultaneous conduction in push-pull switching amplifier A drive circuit responsive to the phase of the amplifier output current eres that the non-conducting amplifier element remains off while the other amplifier element conducts. The output current phase can be detected either from the individual amplifier e... | 06/07/1977 |
