I had endless frustration to get my Fender Bandmaster or even the AC30 affording a mellow tone with the '57 ES -175. Not only that...feedback was a major problem. So I picked up on what Keira mentioned....the humble Roland Cube. This is the new 80W with a 12" speaker. However I found it a tiny bit "gonad-less" in the lower and bass frequencies, so I hooked up the 2x12 Bandmaster cab....I'm very happy with the result. Also, lifting the rig from the floor took care of that terrible deep feedback associated with archtops, as well as of our tomcat who whenever he gets the chance, lifts his tail against all and everything. ?
The nice thing about this Roland Cube, apart from its rich clear tone, aux in, line out, etc. and quality Fx, is that it has a built-in 80 seconds looper. So one can record and overdub small sections to evaluate different tone settings from the amp and guitar. I am happy.
@Keira....there is/was a Polytone minibrute for sale here but the guy decided to take it back to the USA with him. ☹