Can the boss metal zone do the sound of early black metal, i'm thinking about especially about Bathory. It sounds like the dist on metallicas kill 'em all.
Any nasty/unrefined sounding distortion pedal would do. The boss sound is almost too refined. I used to have a nasty sounding DOD pedal that I bought used for like $20. It was so beat to hell and I don't even remember what the name was. It would have worked perfectly for an old school BM sound.
For whatever reason I think his most fitting tone was on "Blood Fire Death"
You have to also remember Quarthon didn't have an extensive recording setup, which is another reason for the nasty garage-y sound on a lot of his stuff. I wouldn't doubt that some of his early stuff wasn't done simply with a 4 track.