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Hiwatt custom 20 tube schematic needed!

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  • Hiwatt custom 20 tube schematic needed!

    Hi,
    I have this Korean made Hiwatt with some repair techs.
    It has hum and noise issues.
    When you put up the master volume with the gain low, you get tons of noise,
    and hum. The diodes are good, but from what they told me there is 60 cycle hum. Anybody have this amp or worked on it or have a schematic?
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