http://support.fender.com/schematics..._schematic.pdf
Amp was cutting out and sounding bad intermittently. I quickly found that if I moved the speaker plug it would cut out. Cleaned all jacks and speaker plug. Then I found if I applied a bit of pressure around the speaker jacks, I could get it to sputter and act as described. I torqued down the jacks and it went away... for a while. So I pulled the jacks to have a look. I found that when off the chassis all is well, but if the threads of the int speaker jack touch the chassis, sound drops and it gets dirty. Can someone explain this, if the jack is fastened to the chassis why would this be the case?
I temp snipped the black wire from the jack to see if maybe I could find a partial short in the switching jack, but no. I must also say there is a homemade DI mod built into the cab with a sheilded wire running up to the ext speaker jack to a pair of resistors between the + and - lugs. It looks well done with an audio transformer and XLR in a box in the cab.
I am missing something here.
Amp was cutting out and sounding bad intermittently. I quickly found that if I moved the speaker plug it would cut out. Cleaned all jacks and speaker plug. Then I found if I applied a bit of pressure around the speaker jacks, I could get it to sputter and act as described. I torqued down the jacks and it went away... for a while. So I pulled the jacks to have a look. I found that when off the chassis all is well, but if the threads of the int speaker jack touch the chassis, sound drops and it gets dirty. Can someone explain this, if the jack is fastened to the chassis why would this be the case?
I temp snipped the black wire from the jack to see if maybe I could find a partial short in the switching jack, but no. I must also say there is a homemade DI mod built into the cab with a sheilded wire running up to the ext speaker jack to a pair of resistors between the + and - lugs. It looks well done with an audio transformer and XLR in a box in the cab.
I am missing something here.
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