I have a JTM45 style amp head with a 2x12" cab with Greenbacks. It's heavy, it's loud, it's clear, it's not forgiving. What I mean by that is that it sounds glorious but only when a good player plays through it confidently. I have found that many younger players have grown up playing modern amps or digital profiling machines (e.g. Kemper, etc) that are far more sensible and forgiving. Loud and not a lot of gain is particularly challenging. When they eventually have the chance of playing an old AC30, Plexi, Hiwatt, Twin Reverb, etc... they often find them intimidating and unappealing. Probably, they think they are going to like them but when they do try them, they often find that they don't. You have to work hard to make them sound good... what do you think?