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 have listed a beautiful pair of vintage, potted Dynaco A-430 output transformers on Audiogon. This is just an fyi. I searched for these for years and unfortunately have discontinued plans to build the 'Ultimate KT88 Amp' featured at VTV.