Opinions may seem to be divided but Nrchy is correct.(1) You cannot easily balance a non-balanced amp but (2) you can make it compatible with balanced sources.
You also ask: "Does any one know of a circuit diagram or a place to come up with one ?" Assuming you mean adding an input transformer for (2), others will suggest specifics. If you mean (1), then you have to tell us what the amp is and provide the original schematic.
You also ask: "Does any one know of a circuit diagram or a place to come up with one ?" Assuming you mean adding an input transformer for (2), others will suggest specifics. If you mean (1), then you have to tell us what the amp is and provide the original schematic.