I picked up a Mod 50 head in a trade with the T/D and SL modules. There are so many tones you can coax from this amp that it's a little overwhelming. I'm starting to get a handle on the amp but I need more time to explore all the possibilities. I'm currently using a older Rivera 2x12Q cab with a Scumback H75 30 and a Celestion GB. I worry that this might not be the best pair for this amp. Anyone care to share their speaker, tube and amp settings preferences?