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.
Sure, you can borrow a prototype and listen. But speaking of kits, I am not ready yet to reveal the schematics. A first, I want to sell few amps, since I have no other income, then may be I will sell kits.