I have an old Symphonic tube amp from the 60's my uncle gave me that's probably about 5 Watts. It's not loud enough for band volumes (obviously) but I dig the natural distortion it gets.

How would I set it up where I can play clean through the HRDlx and then stomp a pedal and have the natural distortion from the Symphonic come out of the Hot Rod Deluxe?
Can I put it through the PREAMP OUT/POWER AMP IN on my HRDlx without damaging either amp?
Thanks for your help.