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The Koch just up and quit yesterday at band rehearsal...no warning, no rude noise or anything, just quit. I've done the following checks: HT fuse OK, Swapped out power tubes, tried extension cab and speaker with new cable. Everything looks fine, all tubes light up, no weird flamey colors, no smoke or burnt component smell, the amp puts out a clean signal in the milliwatt range. Any suggestions before I send it off for extensive and possibly expensive service from the distributor? (Still under warranty I believe.)