Yeah, they are pretty well regarded little amps. They evolved over time into the dual caliber DC series amps. Mo and I have DC-3 models, if I recall correctly. I thought someone else here had a DC5, but I can't remember who. Anyway, the caliber 22+ is the predecessor of the DC series. The cleans are pretty good, fender blackface in flavor, with a decent tube driven reverb. The gain channel is the sort of classic boogie sound, which is kind of hit or miss for people. It can really grind out the high gain, liquid cascade gain, and mean rhythm sounds too. Like all boogie amps, the knobs are 'interactive' so they can take a while to dial in. The biggest complaint I've heard about these is that they sound kind of boxy, but I never noticed that in my related amp. They are built like tanks. Steel chassis, military tube sockets on flying leads, not much board mounted to go bad, buffered EQs and so on. A really nice amp that probably cost a grand when new. I'd give it a sound test.
FWIW, mine has EL84 tubes, but don't expect a voxy feel or sound. The tone stack is much more fender like, but a little less sparkle. It certainly doesn't sound like other EL84 amps I have played.