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.
Somebody was telling me about his homebrew amps, and said he uses transformers from a small 5 man company in England called Ro. Supposedly no web site. Anybody heard of them?