Amplifiers – Including a push-pull stage
Reexamination Certificate
2007-03-20
2007-03-20
Schechter, Andrew (Department: 2817)
Amplifiers
Including a push-pull stage
C330S113000, C330S165000, C330S051000
Reexamination Certificate
active
10376338
ABSTRACT:
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 coupled between the secondary winding of the power input and the output for rectifying the alternating current at the power input. At least a second rectifier is provided which is selectively couplable in parallel with the first vacuum tube rectifier. The at least one second rectifier can be a vacuum tube rectifier with each of the first and second rectifiers having a cathode continually energized by the filament winding, a solid state rectifier or both. The output amplifier has an output transformer having a primary winding with a center tap and with a first pair of vacuum tube amplifiers having their cathodes being coupled together and their plates coupled to the primary winding on opposite sides of the center tap. At least a second pair of vacuum tube amplifiers is provided having their cathodes coupled together and their plates being coupled to the primary winding on opposite sides of the center tap. A selector switch selectively causes at least one pair of the first pair of vacuum tube amplifiers and the at least a second pair of vacuum tube amplifiers to be operational and concurrently causes at least a selected one of the first vacuum tube rectifier and the at least a second rectifier to be operational corresponding to the selected at least one pair of vacuum tube amplifiers and the at least a second pair of vacuum tube amplifiers selected.
REFERENCES:
patent: 4713624 (1987-12-01), Smith
patent: 4719431 (1988-01-01), Karsten
patent: 4916599 (1990-04-01), Traxler et al.
patent: 5168438 (1992-12-01), Smith
patent: 5499154 (1996-03-01), Cullison
patent: 6522752 (2003-02-01), Smith
Schechter Andrew
White & Case LLP
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