Re: H&K Triamp MKI?
I own one. I have the 'rare' comboversion that was only produced in 1995, for a short while (only 500 made). What makes mine extra special, is that it has the 6L6 power tube option (stock was EL34, but mine's a production 6L6-type, recommended tube types are engraved in the chassis).
It's a killer amp! Clean is excellent (and REALLY clean up to pretty high gain settings), really sparkles, very dynamic too. Channel 1B is a bit darker voiced and has a nice warm growl to it. Sounds especially awesome with singlecoils, but a warm low output humbucker will do nicely too.
Amp 2 is the only downside for me. Channel 2A rocks, it has that bright but chunky Marshall Plexi-vibe, but channel 2B is really dark and fuzzy. As they share an EQ, it's hard to find a tone you like on one of the two, that will also sound good on the other one. And due to the shared mastervolume for these two channels, you cannot turn the gain of 2B down without volume loss.
Amp 3 is awesome. Channel 3A is very open and dynamic, while channel 3B delivers big fat chunky balls-to-the-walls of distortion.
There's only two real drawbacks for me, that's the trouble of getting a good sound from channel 2B (so I don't use that channel, I like 2A a lot but just can't get a tone from it that will also sound good on 2B) and the reverb. The reverb is excellent, but it's not footswitchable and the level control is on the rear of the amp (why, H&K, why?).
But all in all, it's still an amazing amp.