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Thanks for the help. Actually I tested both EL34 and 6l6, all from TAD, I've been using this brand since 2014, with no issues util now.

My old beloved 100w Einstein started melting power tubes for no apparent reason. Tried to swap for some new ones, same behavior. Does anyone know any repair center in Portugal? I tried to check on Diezel site, but I think it's down. Thanks.