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bias voltage

  1. daylite

    Transistor-Buffered Zener Regulated Bias Voltage Supply

    A bias voltage design for TA-500, K-100, 500 Mono that's suitable for vintage & modern output tubes. There have been several discussions of the design of the Fisher “bias-voltage from heater-string” method that Fisher used to generate the negative potential needed to bias output tubes. Dave...
    • daylite
    • Thread
    • 500 mono bias adjustment bias voltage ibam k-100 ta-500
    • Replies: 3
    • Forum: Fisher
  2. M

    Akai X-200D reel to reel excessively high bias voltage

    Hi all, Briefly, I picked up a "for parts" X-200D and decided to see if I could get it back in service. It was in decent mechanical shape but needed a fair bit of clean up. Still it has had its fair share of surprises. It had a weird 29.4kHz circuit oscillation in playback mode which pegged...
    • michael_w
    • Thread
    • akai x-200d bias voltage high voltage reel to reel
    • Replies: 2
    • Forum: Tape
  3. junkscience

    Question re: Marantz 8b high voltage power supply diodes

    Question regarding Marantz 8b high voltage power supply HV PSU diodes replacement I am restoring a Marantz 8b amplifier. It is a straight forward decision to replace the selenium rectifier. It seems that this would be the opportune time to also replace the high voltage power supply diodes...
    • junkscience
    • Thread
    • bias voltage diodes high voltage power supply marantz 8b rectifier selenium
    • Replies: 18
    • Forum: Tube Audio
  4. RogerMod

    When we bias a tube amp what are we measuring?

    There seems to be some confusion about biasing a tube amplifer. I would like to ask the readers here to give their thought on what are we adjusting and what are we measuring when we adjust a tube amplifer's bias. If one were discussing his amplifier with another person what would be the...
    • RogerMod
    • Thread
    • bias bias voltage bias voltage at zero idle current tube amps
    • Replies: 93
    • Forum: Tube Audio
  5. tube-it

    Yamaha CR-420 Intermittent Bias Voltage

    I just finished restoring a CR-420 I picked up a working but ugly CR-420 to replace the guts in a cosmetically perfect yet blown unit. I did a full re-cap while I was in there. I am now getting intermittent distortion in the right channel that will go away if I crank up the volume a bit. I am...
    • tube-it
    • Thread
    • bias voltage vintage reciever yamaha
    • Replies: 9
    • Forum: Yamaha
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