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 just built an aikido pre and get this horribly distorted, cracking, fuzzy sound at the output. I forgot to hook up the heater supply and ran it for about a minute before I found the problem. Could this have caused a problems with the tubes.