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.
I've bought three pairs of these a few years back; one is performing very well on a trioded el84, second pair on a lesser 6ck4 being rebuilt for 'RH6v6', third pair unused for now. Price/FR extension seems hard to beat (there's a FR graph somewhere on the website); haven't heard any of the high-class SE trafo's. I must add that Jan is a pleasure to do business with.