I may want to hear a song on tubes and then try it on the big Technics boy. And to be honest, I also like a smooth technical solution 😁 I also know myself and if I have to climb behind speakers and switch cables - I will simply don't do it very often.I simply don't understand why, unless you are going to be changing your amplifiers every 5 minutes, you simply cannot just swap the speaker cables from one amp to speaker cables from the other amp. If you use a pair of wires with banana plugs on the end this will take less than a minute to do and ultimately will be a whole lot safer for you.
One more question if I may : it's OK to connect a source (say a turntable or a streamer or CD player) to multiple amps at same time, right? I will use one amp at a time, just want to have connections to both in place to - well, you probably have guessed it - avoid switching cables 😄