I say go for it! I did the same w/ my VR4-JRs, using a VAC tube amp on top and a Digital Amplifier Co. Cherry amp for the bass. If the gains are close enough, it works great. Tried a monster Carver SS amp on the bass but it was dramatically outperformed by the Cherry. (Tip - it can help to evaluate each amp, either the bass amp or the M/T amp, by disconnecting the other amp - for example listening to only the bass cabinets w/ no M/T is very revealing!)
Turns out the Cherry sounded so good full-range (along w/ heat/ tube life considerations) I sold the VAC and now run a Cherry JR full range.
Turns out the Cherry sounded so good full-range (along w/ heat/ tube life considerations) I sold the VAC and now run a Cherry JR full range.