@david_ten
I've been running this sort of connection for about 10 years in one of my prototype amps and have modified many amps with this connection since. I first read about it when researching some of the works of George Philbrick, who is often credited (inaccurately, but he was certainly an early pioneer) with building the first opamps, which were vacuum-tube.
Your Plan A (Post above) is superior to > Plan B (Input transformer) Both of which are superior to > What I am doing with the cable approach (Keeping Pin 3 'Open/Not connected')?I've listened all three ways. The transformer has to be pretty good to keep up- it tends to have less bandwidth and detail and this is measurable (at least its bandwidth and distortion is). I prefer to use the signal that is presented by the balanced source- it tends to be more accurate than if you only use one phase as in an adapter. This is probably because the single-ended connection is more susceptible to noise and the like.
I've been running this sort of connection for about 10 years in one of my prototype amps and have modified many amps with this connection since. I first read about it when researching some of the works of George Philbrick, who is often credited (inaccurately, but he was certainly an early pioneer) with building the first opamps, which were vacuum-tube.
