A Source is a Source, of Course, of Course...
Now now, what are we dreaming about, Hmmm?? I'd say more of a 70's design. Or are those dual quads? Some of us (most :) ) here remember carburetors, right? Frankly, I don't miss them.
Actually, I prefer Y cables, those adaptors are a bit tight clearance wise when making connections. Of course the paralleled impedance will be lower than usual, but how low depends on the sources. At less than 10k Ohms, bass can start to roll off but nothing gets damaged.
So let's see, you need a phono preamp, and Seawolf wants to bypass his, are we ever satisfied with what we have?? Tsk tsk...