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SFTR 100w MV early breakup on vibrato channel

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  • SFTR 100w MV early breakup on vibrato channel

    The vibrato channel on my fender twin reverb 100watt Master volume breaks up at about 4 or 5 on the dial.

    Set with the controls 734 TMB It sounds great , with or with out the pull boost.

    The Normal channel only starts to break up about 10 on the dial with the same 734 TMB.

    I've checked the circuit with the schematic cannot understand why the vibrato channel should breakup early.

    Should it the vibrato channel breakup that early? if not what could be causing it, how can i tweak / refine the breakup characteristic? or replicate it in another amp? Some help would be great.

  • #2
    Have you swapped tubes?
    Education is what you're left with after you have forgotten what you have learned.

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    • #3
      yep, several times , it not new , its been like this sine i got the amp ..

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