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Sound City 120MK4 Bias mod, a slight return

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  • Sound City 120MK4 Bias mod, a slight return

    I know this has been touched on before as the 120's don't have enough negative voltage on the bias to run newer EL34's safely. I happened to be reviewing a bunch of schematics of SC amps and found some differences in the bias circuit on the Bass 150 that I thought may be transferable to the 120 to get the bias better suited to newer tubes. I give you the 2 bias schematics for your review and comments. Thanks!
    120Mk4bias.pdfBass150bias.pdf

  • #2
    Hi Look up a Voltage doubler circuit. This should give you about -70v and then you can bring it down to whatever you want.

    Click image for larger version

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