Using both the Balanced and Unblanced inputs

It works that way on my Mk IV. But don't assume ;--) Try it, with both volumes turned down.

Or if you can read schematics, it's very easy to see if they are "connected in some way" as E. puts it. In the older Gordon Gow Commemorative Edition (the first MC275 with BAL inputs) the inputs were connected. So are the BAL and UNBAL inputs of the new (mono) 50th Anniversary MC75's.

However, I KNOW, both from the schematics and from actual operation, that the MC275 Mk IV has separated inputs. I also KNOW that the Mk V has the same circuit as the Mk IV (except no level controls on the UNBAL inputs.) However, since I haven't actually seen the Mk V scehmatics, or used one, I'm not going to guess ;--)

It won't hurt anything to try. A friend with a pair of the new MC75's tried it, and simply got crosstalk, which is how we found out that ITS input circuits ARE connected.

Neil
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good call Al (an ounce of prevention . . . . . ;--)