I really don't, other than I want it to sound like an SVT![]()
Sometimes it's the defects that make it..... components can be too perfect. The carbon comps behave a little differently, and so do paper vs film caps.
To some degree, it's like the type of joint in the guitar neck, or the wood.... a few can tell, most can't. But if you can, you want it.
If you want your life to be in danger, clean the contacts of a Hammond B3 when it is in for service.... They sound kinda sterile and crummy until 30 years of bars ciggy smoke and general pollution have gotten in there, so odds are the owner will be looking to flay you and dry your hide on the back fence. Just another case of the defects making all the difference.
"Those marks aren't defects, son, those prove it is genuine leather".