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Hartke lh500 issue. Popping sound.

Don't go spraying "miracle fix-all contact cleaner" anywhere until you know exactly what the actual problem is. IF that's the problem (which I doubt in this case) you can end up with a bigger and more expensive mess as ruined pots is a much more expensive outcome.

The only material that I have seen that is generally safe is DeOxit D5, and only the tiniest amount possible.
 
I think I have a problem with the differential transistors leaking some DC on speaker outputs and tripping the protect circuit send a message to Larry Hartke earlier in the week have not heard anything back