Polyphase Power Supply (i.e., For An Electrode, Cathode Heater, Or Filament) Patents (Class 330/113)
  • Patent number: 7193458
    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.
    Type: Grant
    Filed: March 3, 2003
    Date of Patent: March 20, 2007
    Inventor: Randall C. Smith
  • Publication number: 20020135947
    Abstract: Assuming that a distance between an upper shield layer and a lower shield layer in an area, which overlaps only a first electrode layer, but does not overlap a second electrode layer, is G1s, and a distance between the upper shield layer and the lower shield layer at a position in alignment with a center of a multilayered film is G1c, a difference in value between G1s and G1c is set to be not larger than a predetermined value, whereby an effective track (read) width can be reduced.
    Type: Application
    Filed: March 20, 2002
    Publication date: September 26, 2002
    Applicant: Alps Electric Co. Ltd.
    Inventors: Daigo Aoki, Kenji Honda, Kiyoshi Sato, Naoya Hasegawa, Yukie Nakazawa