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Posted by Ralph (M ) on January 19, 2017 at 10:37:08

In Reply to: stereo, single ended phono pre used in single channel balanced mode? posted by Ugly on January 17, 2017 at 20:49:08:

First off, your CMRR (common mode rejection ratio) will be terrible! CMRR is actually pretty important in a case like this.

What is needed is at least a differential input! That would improve the CMRR quite a lot.

The problem is that the cartridge, which is indeed a balanced source, has its outputs on pins 2 and 3 of the XLR connection (if in fact that's what you plan to use). On any equipment that supports the balanced line standard, the inputs are pin 2 with respect to pin 3 and ground is ignored.

Your setup won't do that as it sits, but if the input circuit were somehow to get wired together differentially, you could make a go of it.

IMO its impractical. I think you're going run into hum problems and not much output, unless you can find an input transformer with a center tap on the secondary side feeding the preamps.

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