Talking about tubes. Imo buying a "very expensive" tube gear should not involve further tube rolling unless it is for a maintenance purpose. The designer should have extensively tested his gear with different tubes to find "the" sound for that equipment. When I hear people say this crazy expensive amp or that very expensive phono has to roll tube to sound excellent I wonder why the crazy money one paid for that equipment didnt already cover for the tubes. I am talking for example a super expensive gear like Kondo Kagura.
Add to that the additional cost of the esoteric NOS tube, and I think we have our answer as to why these types of tube are not standard.
Likes: Uk Paul