Great video, thanks for posting this. An additional issue is, you can't be sure what your buying and from who. Your favorite distributor sells you their parts and you assume (hope) they are what they say: JJ, Tun-Sol, EH, etc. But do the supply houses even know what they are buying? Do they care? Tubes are not not cheap anymore, we need to know more detail regarding the origin of the parts we buy. A distributor should be proud to advertise their tube are guaranteed to be made in xyz and can prove it. Fakes are everywhere.