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Maybe someone can point me in the right direction- The volume will suddenly jump up either channel randomly. I know it's not the preamp, I switched preamps and the issue remains. The power tubes don't have many hours on them. Am I looking at a cap job? I have swapped the 12AX7s, could they be...

I recently acquired this 1978 Mark I and it sounds great. I have a couple questions about the rear panel - 1. There's a switch on the right hand side conneting the a resistor network. Does anyone know exactly what it's accomplishing? 2. What is the jack above the Slave jack used for...