2nd the NOS Mullard 12AX7 in the pre.
And Sylvanias too.

I have played blues with this and love it, you can dial in touch very nicely.
Both Strat clone, pedal and lapsteels all sound nasty or sweet depending on choices of set up.

I also in a pinch plugged a blues harp player with bluuet mic in
and his eyes grew VERY wide at the sound he got.

I had mod'd him a Valve Jr, and he loved that for portability and sound,
but the Overtone and 112 through a 15,000w PA made him way too happy.

You can get a decent crunch over you clean  in the 'clean channel' with a high output guitar,
I like to stay 70% and it stays pretty clean and crunches out at 100%.
But that level can go into too high compression of the Overdrive channel.

I find this can be good if not to hard pushed,
but I prefer to set this for 'touch' level al al blues style,
when I have the guitar up 70%
and I can get clean and slight compression of overdrive with just pick control.
Then I can go 100% guitar and get a smooth overdrive, but not too much compression.

You can dial in a spot on Santana Abraxis sound if you like.

I have set this for a Marshal like flat out metal sound with the bass rolled off it does get there.
Somewhat similar to jumpering inputs on an an F56a and rolling most all bass off.

Good more midrange and Stevie Ray V. shows up with it cranked.

And clean but a touch of grit and less mids gets Duke Robilard.

One comment was it could be brighter. 
But that player plays screachingly bright in general.

I brought this amp to a Blues Festival and 70% of the lead players picked
this amp with a Tone ring 12" cab over the other 6 stage amps available.
Some also played my 5F6a with 4-10 Webers.

I also played pedal steel though it on a very large stage doing
Skynerd's The Breeze and it sounded hot cranked on OD.