• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

A 'unique" idea for prototyping

Looks like a good european source for output transformers. Anyone tried their A470 transformer ?
I'm using Piemme iron in two of my amps. Good budget OPTs and the chokes are also fine. The big mains transformer I bought from them buzzes a bit but so does nearly every other transformer too once they get into my house. DC on the mains or something I guess.