There is no better test then swapping tubes in the head , recording it . And he does it .don't care for his schtick either, but in this case, I thought he did a descent job on the tests
One day I need to do a comparative video of pickups with the same amp in high gain . I think the difference will be as close as the tube swap. Maybe a little more hm? It can be cool to do it as I own many guitars with different pickups in each models