I've always played the MosValve (and other power amps with presence control) with the presence totally OFF. The added presence sounds artificial (too bright) to me.
One thing I discovered is that the Dual Showan Reverb Pre-amp'd to the MosValve 962 is a good match.
I had been running the Moss with the Alembic F2B pre-amp and Lex 'verb forever.
I'm gonna put the Moss in a 2-space rack by itself now, and use it with the DSR (for non-Mac-cessible outings).
I kinda hate those little "clicks" in the volume knob on the 962 (the volume I need is "between" clicks)... But I like being able to taylor the treble with the Presence knob for very low volume Jerry tone but with the DSR at 5-6.
I just set up another 1x12 cab and am going to run in Stereo (dual-mono) with the Moss and MC250.
Funn Stuff!
Oh yeah, one other thing with the Moss... Is there an easy way to re-tension the internal 1/4" jack tip-connector-thingie without opening up the chassis?
The Channel A and B 1/4" inputs slide right in and are like barely making connection.