Before you do anything...
* You MUST have the transistors clamped tightly to the heatsink when the amp is powered up.
* You should also insert a 15 amp fuse in the B+ line feeding the amp to help protect it if there is a problem (or accident) that causes excessive current draw.
* When probing any points with a meter or scope, be VERY careful not to let the probe slip and short between adjacent pins.
Do you have a multimeter or an oscilloscope?
Remove the top cover (screws on bottom around perimeter -- leave the ones in the center) and unplug the preamp board from the main board. Does it still make noise when powered up?
* You MUST have the transistors clamped tightly to the heatsink when the amp is powered up.
* You should also insert a 15 amp fuse in the B+ line feeding the amp to help protect it if there is a problem (or accident) that causes excessive current draw.
* When probing any points with a meter or scope, be VERY careful not to let the probe slip and short between adjacent pins.
Do you have a multimeter or an oscilloscope?
Remove the top cover (screws on bottom around perimeter -- leave the ones in the center) and unplug the preamp board from the main board. Does it still make noise when powered up?
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