Re: Swedish Death Metal tone
As an HM-2 owner who has done that sound before, I have to echo the people who say that a lot of it is the rest of the band -- a huge part of that sound is the bass, and also the mic technique (Sunlight Studio used open-back cabs and mic'd from behind).
You *don't* need a tube amp to get the sound, though -- in fact, Nihilist, Carnage, Dismember, and Entombed ALL used solid state amps on their most iconic albums. You DO, however, need to run it into a distorted channel to get "that sound". A lot of ugly, messed-up, solid state clipping is *good* when you're trying to get this ugly, messed-up sound, so don't be shy. Crank every knob on the pedal to 10, and crank the distortion on the amp as well. You also need a ton of mids on your EQ; the "classic" way of doing it doesn't just have all of the knobs on the pedal at 10, but also all of the EQ knobs on the amp (other than presence, if your amp has one) at 10 as well. Yes, it's going to feedback like crazy when you aren't playing -- stomp the pedal off between songs (if you watch live vids of Dismembered, they have to do this, and they squeal like crazy when they get too drunk and forget to).
https://soundcloud.com/user848864560/ultra-v-demo-2/s-L6Yhi -- sorry about the terrible playing here (I did this clip on a guitar I had gotten literally just earlier that day, and I wasn't used to its bridge yet, so I was struggling to find a good spot to rest my wrist and couldn't tremolo pick properly), but it's a good example of the sound. It was just guitar -> HM-2 -> Laney Linebacker (the old '80s solid state one, not the new modelling one) -> Marshall 4x12. All EQ settings were dimed other than presence (which was at 0), and gain on the amp was also dimed on the overdrive channel.