2 amps with same speakers NON-Biamp ??

This is a 'what-if' that keeps popping up in my head: You have a preamp with 2 sets of main outs. One set is connected to stereo amp A(SS), the other to stereo amp B(tube). Each amp is connected to the same pair of speakers in normal(non-biamp, non-biwire) fashion. When I want to listen to rock/pop I could fire up the system and amp A only. For more gentle/refined music I would turn on amp B instead. I wonder if this has been done or is doable or wise. My concern is that the output stages of the amps would interact with each other and degrade the sound or worse, i.e. damage one another.