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.
BTW, check out Audioforum.be, they organize similar meetings although not all DIY oriented.
Check with either Marco Lisi or Benny Swinnen about future plans/events. You can tell them hello from me.