Using the Mc275 balanced input bypasses the input/phase inverter 12ax7 tube. There will be less noise and distortion (not that I could hear any with my MC275 MKV).
In my two channel, I use balanced interconnects throughout. I checked with other more experienced MC275 owners and that is what most of them use and recommend.
I've heard both though not in the same system. Both are great but the MC275 is a legend - and rightly so. It has withstood nearly 50 years of scrutiny which says everything about its sound quality. I am very impressed every time I hear one. If I didn't already have a MC240, I'd have a MC275.
I own MC 275 IV and ARC VT 100 and I use the Mac because it has attenuators so I can use it with no preamp with vinyl and sound it much better. ARC is very good if you use digital source. Mac is very reliable, built like a tank, wonderful refined sound all over the spectrum. ARC is more dynamic and less refined. To be used with balanced connections for better results.
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