Hello all!
I have a restored AU-7900 that functions fully however when the unit is shut down I get a nasty POP through the speakers when the power switch is set to OFF...ONLY with the tone control switch set to ON. IF the tone switch is set to OFF then I get no POP.
The tone control board has all new caps and transistors.
Voltages measured on the tone board are below and all measure a tad higher than the schematic, but consistently relative. The emitter of TR 08 is supposed to be 0V but measures 60mV which is one that may be an issue.
Any advice of how to proceed would be appreciated.
Thanks!
Zeke
I have a restored AU-7900 that functions fully however when the unit is shut down I get a nasty POP through the speakers when the power switch is set to OFF...ONLY with the tone control switch set to ON. IF the tone switch is set to OFF then I get no POP.
The tone control board has all new caps and transistors.
Voltages measured on the tone board are below and all measure a tad higher than the schematic, but consistently relative. The emitter of TR 08 is supposed to be 0V but measures 60mV which is one that may be an issue.
Any advice of how to proceed would be appreciated.
Thanks!
Zeke
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