I would call Bill Thalmann and talk to him about what can be done with that Premier 17 IF you like but want to dramatically improve it’s performance. Bill was once Technical director at CJ. That’s what I’d do. Unlikely the Cary would be "significantly" better, more like different and possibly preferable or maybe not same with a newer CJ. If you want sexy and glowing tubes Supratek might also be a possibility.
Musictechnology.com
Musictechnology.com