I'm looking into that harley benton too i'll tell you what i've discovered so far.

It has identical circuitry to the epiphone VJ except of course the tone knob.
Apparently it is made in the same factory as the VJ
It has less gain than the VJ (this is a plus for me but maybe not for you)
It's just as easy to mod as the VJ due to the same circuitry
you can make a cab to match. some wood some speaker some tolex and a grill cloth.

anyway. it has a sovtek el84 and an electroharmonix 12ax7 but i'm not sure what tubes come stock with the epi.

edit: just checked. same tubes as the epi.