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RE: St70 bias resistor

Steve - Here's another tip I learned about the bias resistors. They are connected to Ground through the octal socket tabs. These tabs start to lose their Ground integrity after a while. I was fixing an amp whose bias would drift around a little but never stabilize. It drove me nuts until I measured the resistance of bias resistor Ground end to the main filter cap Ground. I found about three Ohms there. So, I hardwired the bias resistor Grounds back to the main cap and all was well. Don't depend on that old connection to chassis.


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  • RE: St70 bias resistor - Audio Pete 14:42:44 05/30/17 (0)

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