High gain valve amplifier. 100w from 4 6L6. Checked it over and it is good to go. This is a pretty serious device. Plenty of demos and stuff online, been used by Paul Gilbert, the Tony Iommi sig of this series is basically this amp with the boost stuck on.
In Greenbank, welcome to come try it, got a cab about.
Check out Ampstack for more amps stuff, and also my band Warrior Pope.