You can run both amps together as long as you have a pedal that gives you a stereo out.

You can also use an AB box, which allows you to hook two outputs (your amps) with one input (your guitar.)

Effects that have a stereo effect (delay, chorus, etc.) can run stereo as long as the pedal has two outputs. The nice thing is that you don't have to have the effect on to run to your two amps.

Do you have any pedals that do such a thing? :confused: