The 700RB sounds different than the 800RB so they are not interchangeable. The SVT-7 Pro is not like other modern Ampeg heads either so I wouldnt make any presumptions. Best bet is to try out the SVT-7 pro and then make the decision, assuming you know what the 800RB sounds like.
The 700rb-II can most definitely cop any sound the 800rb can make, plus a whole lot more...
- georgestrings
