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cathode bias

  1. sbcrockett

    Fisher X-100-2 safety mods and maybe more???

    Hello friends, I thought it was time to start the upgrades on my Fisher X-100-2 and want to document the information and photos. I know there have been many such threads covering what I'm planning on doing but I'm not quite expert enough to translate the information in those other threads and...
    • sbcrockett
    • Thread
    • cathode bias screen triac x-100 a x-100-2
    • Replies: 24
    • Forum: Fisher
  2. M

    Harman Kardon A300 - Change Cathode BIAS method

    Hi all, I need some advice and guidance. I have an HK A300 stereo tube amp. Presently the output tubes are biased throught the 12AX7 tubes I want to split the 4 output tubes from the 12AX7 preamp tubes to allow me to individually bias each output tube (orignal...
    • McScottlee
    • Thread
    • cathode bias harman kardon a300 hk a300 stereo tube amplifier
    • Replies: 17
    • Forum: Tube Audio
  3. Marsman

    Octal Mullard 5-20 stereo with KT88

    Hi All, this is my first thread on AK :banana: I am constructing an amplifier that is inspired by the Mullard 5-20 amplifier. Changes to the original design are: EF37 input pentode, 6SN7 phase inverter/driver and KT88 output tubes. Has anybody attempted something like this? :beatnik:
    • Marsman
    • Thread
    • cathode bias kt88 mullard 5-20 push-pull
    • Replies: 27
    • Forum: Tube Audio
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