This Studiomaster Trilogy 166, came to us for a service.

The pots were stiff and some of the channels were cutting out.

 

Well put together, each channel has its own pcb, all of which are then daisy chained.

I started by removing the knobs and nuts from the pots.

Then 1 by 1 unsoldered the pots, cleaned them and put them back.

Inspect the board for dry joints, mainly around the input jacks.

These are the pots from just 4 of the boards

Re-assemble the unit and test.