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stereo tube amplifier

  1. 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
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