Peavey Pacer 100-SS is one of the best amps if not the best for dirt box distortion. I have been using these for decades . I run them clean with a closed back modification (board with insulation screwed in the back with speaker jack) EVM 12 Proline speaker vastly improves the sound. Master on 10 ,EQ'S on 10, no reverb ,input volume low . More @Wikipedia
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