If you're seriously in the market for a Dumble type amp, you should consider Welagen.
Buddy of mine ordered a custom Welagen Overdrive Special clone made with all true vintage parts and the fucking thing sounds incredible, for everything from jazz and blues up to easily high gain hard rock territory, and that's without even using a boost pedal.
I always kinda wrote Dumbles off as just fancy overhyped Fenders but that Welagen made me a believer; truly one of the best sounding amps I've ever heard/played.
Of course he also paid like $9,000 for it lmao; damn well better sound good