Hi, hope this is a valid place to post this. Both are great and deserve more attention. Mr. Cordy is using a KPA from time to time, but this is not the point. Great Utubers out there but I feel these two are under the radar. Cheers.
https://www.youtube.com/user/chuddgriffin
https://www.youtube.com/user/wizardofshred
https://www.youtube.com/channel/UC91Etr_p2Pd0T2hNrI0m2eg
this is more about efficiency in general than about guitar playing but nevertheless worth being checked out.