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Now that I've read your post, I realize where I made a mistake...

Thank you for your insightful posts!

In hindsight it seems so obvious to me and I feel so foolish now...

I made the mistake of tying each of the preamp signal ground to pin 1 instead of leaving it floating.

I don't know what I was thinking about.

As your previous post suggests this is not how balanced is done!!!

I need to rerun the experiment.

I'm especially feeling the pain since right after I posted yesterday I thought the experiment was over so I decided to switch my SL1200 back from shielded twisted pair cables to coax cables. Anybody who knows how much work it is to pull apart the SL1200 chassis to change wires knows how much fun I'll be having doing it all again to rerun the experiment. Grr!!! probably somewhere around a half an hour just to swap out tonearm cables probably. Grr. I like to do things the hard way sometimes.

Maybe I'll get back to it next weekend.

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