Including A Cathode Follower Stage Patents (Class 330/153)
  • Patent number: 7511571
    Abstract: A novel single-ended screen-regulated cathode-follower output topology for implementing vacuum-tube audio power amplifiers for the reproduction of high-fidelity music with minimal audible distortion. The screen regulation substantially reduces the distortions and noise in the current fed to the output tube by a non-regulated power supply. The noise and distortion of the power supply voltage are thereby prevented from intermodulating with and distorting the music signal.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: March 31, 2009
    Inventors: Scott Frankland, Martin G. Reiffin
  • Patent number: 5880632
    Abstract: There is provided a tube amplifier comprising a first vacuum tube K3 having a plate applied with a positive voltage and a cathode applied with a negative voltage by a first resistor, a second vacuum tube K4 having a grid connected to the cathode of the first vacuum tube and a cathode or a heater applied with a voltage close to a potential of zero in relation to a plate voltage, and an output transformer TF1 having a first coil and a second coil which is connected to a loud-speaker, said first coil having a terminal connected to the plate of the second vacuum tube and another terminal applied with a positive voltage. Also, time means is used to optimally maintain the grid voltage of the second vacuum tube when the power source is turned on, and the plate voltage of another vacuum tube K1 provided in a preceding stage of the first vacuum tube is controlled to maintain the negative voltage applied to the grid of the second vacuum tube at a desired value.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: March 9, 1999
    Assignee: Wako Technical Co., Ltd.
    Inventor: Fujio Yamasita