Hi, I have an old rare German amp called Suprem Solist. It sounded real cold and distorted when I got it. Couldn't get any clean sound out of it. Changed the power caps and put new tubes in it. The bias was still real cold (PV 316 and 34mA per tube). I changed the cathode bias resistor (it was a 300 ohm) to a 220 ohm. Still cold and distorted (PV 298 and 46mA per tube) but a bit better. The amp was set on 220V (selector switch for voltage). I put switched in to 240V (i am in Europe) without any problems. Switched it back to 220V. That's were the amp shorted. I saw a flash at the ez81 tube. There was no smoke or a bad smell. Now the amp is dead, nothing lights on. Any ideas? Bye bye power transformer? Any insights of why the amp sounds distorted? Didn't checked the speaker jet. I bought it the amp cheap as a project amp. Couldn't find a schematic of the amp. It got two EL34 (new JJ's), EZ81 (new JJ), 3 ecc83, 1 ecc40 (for tremolo).