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If you had really done it balanced there would be no hum.

Posted by Ralph on May 30, 2017 at 10:25:34:
-Thats one of the 'things' about balanced!

The easy way to do it of course is to run balanced from your tone arm to input transformers, which then convert to single-ended operation for your phono section. Any SUT and any transformer can do this.

To get two mono single-ended phono sections to behave as a balanced phono section, about the only way I can think of involves an input transformer to do the phase inversion.

IMO though, you would have been better off to get an actual balanced phono section, as it would work properly and would not have sent you down the rabbit hole.