What I do: Before and after

So, here’s the kind of work I do. I’m obsessive about these amps, and I tear them down to the bones and inspect and rebuild everything. My primary concern is reliability. I don’t want these amps breaking down in the field, and so far, not a single one has.

Before:

Pretty typical as they come to me. Dusty and tired. Issues found: Loose chassis ground, cold solder joint on power supply drain resistor, slight gain mis-match in left channel input, 47uF bypass capacitors on output modules deteriorated with high ESR.
Pretty typical as they come to me. Dusty and tired.
Issues found: Loose chassis ground, cold solder joint on power supply drain resistor, slight gain mis-match in left channel input transistors, 47uF bypass capacitors on output modules deteriorated showing high ESR.

After:

Ready to rock.
Ready to rock.

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