[codefox1]

Now the sole exception. If you have two radios, each with PP output, but the primaries are reversed, and play them in the same room, they will be out of phase and will not sound as good as if they were the same. I think nobody worried about this ever in the past, and as a practical matter, the number of audio stages might or might not be the same for any two sets as each stage inverts the signal.

Of course you will really notice the difference in a stereo setup if you miswire your speakers.