The PSA-1 is okay.. Not great, it is an older design, after all..

The Trademark series is much better, IMO..
Maybe go looking for bootleg recording of recent Fates Warning live, JIm Mathios is running a PSA-1 from what I understand.
The thing is, no matter how far solid state has progressed; the extremely clean, and extremely high gain, tones are it's only selling points..
If you're looking for slight crunch, or light break-up, go tube.
I'm very happy with my Tech21 Trademark 300 head, but I run it clean, or full bore. I have no use for blues tones.

Tech 21's Marshall emu will turn heads(had our amp tech thinking it was a JCM900 SLX when we cranked it the first time, he was convinced it had tubes)..
