If you're looking for an amp that will accurately reproduce the output of your guitar, seek out an old Roland JC amp. The JC120 was the biggest of the series, but the JC90 and JC60 also share that sound. We're talking clean, smooth, transistor stereo accurate sound here. Jazzers love these amps.

If you want a tube amp amp that will bring out the best of any guitar you plug into it, that will accept any bizarre EQ you dial in, and still sound like your guitar and your playing, then only a Magnavox-era V-series Ampeg will float your boat. I have a 1976 VT-22 and a 1977 VT-40 (rebuilt as a 1x15" combo), and I just don't see myself buying anything else. I also have an early-80's G-18 transistor amp, but it sounds like a tube-job. And it's also a Magnavox Ampeg.

Most other amps have to be set up 'just so' and pushed exactly into their 'sweet spot' to deliver the signature tone that made that brand famous. And then you sound like any other doofus who plays that amp. With a V-peg, it's all sweet, and it all sounds as individual as you do. If your skills aren't up to being presented very clearly, you had best do some woodshedding, 'cause with these amps, there's nowhere to hide. But if your chops are righteous, these amps are loud enough that the audience feels what you play as much as they hear it.

It just doesn't get any better than this. :D