I swear, I think I asked this question on a forum years ago, but I can't find the post. What's the main difference accounting for the difference between "wooliness" and "definition" in an amp's overdriven sound. By "wooliness" and "definition", I'm referring to the difference in sound between a JTM45 (wooly) and a Super Bass (defined). Or similarly, between a Fender tweed (wooly) vs a Fender Blackface (defined). Is it an issue of power supply filtering, primarily, or something else? Thanks.