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.
It's an interesting breadboard device but not a tube tester IMO. Being able to listen to the tube and optimize the output on the wave form like he did are very powerful features!
Too bad you need a complete instrumentation complement to put it to work.
