There's a difference in sound quality of 300B tubes; a Genelex Gold Lion does not sound like a Western Electric; I've had both and found the extra money for the WE's to be totally worth it for me.... I saw that video was out there but haven't watched it yet - I shall do so!
Three videos: SET amps, Chesky, Gould
Three videos for your delectation.
OCD Mikey does an interesting one on SET amps.
https://youtu.be/VFHP_zvgaoc
OCD Mikey does another one with David Chesky. Chesky is very refreshing to listen to. Knows his stuff, loves good sound, realizes how variable tastes are, knows that one need not spend untold thousands to get good sound provided some basic parameters are respected (room!).
https://youtu.be/WykgotJA9Kc
Last video is on different pianists reacting to Gould. Good channel.
https://youtu.be/dgUnUd9oBSc