Hi.
The tubes are new Electro Harmonix EL34 with no. on 16 07 both. Mutched. New preamps tube as well. Speaker conected properly and it did not fix the problem. I think it might be a production issues but don't know how to check it. I sent an amp to Amps repair shop. I am based in Scotland and there's not Line6 service hear as far as I know. We'll see