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.
If anyone is interested, I purchased several of these board from a guy in Belgium. They were around $27. If you want any, shoot me an email to email@example.com . I'll eat the shipping costs since I wanted them for my project.