After using it with a legacy EV 12" 8 ohm speaker... it sounded so good I decided to try it with a Celestion G12H90 8 ohms (in a Line 6 1X12 cab)…
To my ears, the mids were much sweeter than when used with a 4 ohm 15"? So yesterday I spent some stage time experimenting more with this 8 ohm 12" speaker.
I used the "Treble" eq to dial in my highs, the "Bass" to dial in my lows, and than I carefully adjusted the tube preamp volume to dial in my mids.
I found a point where everything sounded so good!
Now I'm not a techy when it comes to amps/speakers, and I'm not sure why the 8 ohm 12" sounded better than the 4 ohm 15"... or why the tube pre amp smooths out the harshness of mids... so maybe someone on the forum can enlighten us on these points.
I do know this, I love this little work horse

Thanks Tim!