New pre impressions...
Back to the Dared pre... I let her warm up for an hour (stock tubes) this morning before setting down for a listen. Put in some Neil Young...
Although changes are suttle in some areas... the vocal range is the biggest change, wider presentation (I thinking I can play with speaker placement some more now if that makes sense), just a little more warmth. So I put in some Stevie Ray Vaughn and had the same impressions.
The highs sound more detailed or crisp, kinda not where I wanted to be with horns, but then again... stock tubes.
So I listened to her for about 3 hours this morning.
And decided to go ahead and roll out the 5UG4, 6V6, and 12AT7... all singles.
Warmer her back up now!

MC-7P tube preanp, BBE2002R, Marchand XM44, TFM-35x .002, TFM-35x, M1.0t MKII .002, M500t, Silver 7t's, SDA-360 and Klipsch KLF-30's w/crites crossovers...

I think he has OO!! And with the tube rolling, a somewhat expensive one too!!