Using Mesa Boogie Studio 22+ as preamp

[jokkos]

I got a Mesa Boogie Studio 22+ 1922 and I think the sound is really good if I connect the send output to a solid state Fender M-80 Chorus input. I have read that you can damage the valve amp if it not gets any load, but there is still sound coming from the Mesa Boogie amp speakers, even when the return is not connected. Anyone know if I'm going to damage anything? or if there any better way to do this?

 

[D-Max]

When there are speakers connected to the power output of the 22+, no problem.