Jumpering from the input of one amp to another not only works, it gives you a whole new dimension in the characteristic of the sound. For my big show last month (private convention, 1200 people), I brought my three Twin Reverbs, two for me to jumper, and the third for the other guitarist to jumper with his Twin... neither of us had tried this before, both of us were very pleased.
Pro tip: Leo provided two inputs per channel; #2 is -6dB relative to #1, so use it for sound check with guitar volume wide open. For performance, switch to #1 and back off the volume a bit. 
Recommandations for Hollowbodies for $600 and under?
Today, 05:20 AM in Guitar, Amps & Gizmos