Yes, i know it's a PA amp, but its circuit is still pretty generic... and got a tube power section.

So anyone ever played and or mod it? If so, how much would you think the PA head alone wouth worth?
Ibanez SA-120 (ed.2006)
BluesJr 1996-B + cathode follower + texas Heat
Crate CPB150
Homemade 4 x 10 cab Bass closeback
Metal Muff