This may be considered old-fashioned, but how about just playing records through it? I've always done that, and it has worked just fine for me. Personally, I like to hear the gear burn-in.
Phono Section Break-In CD ??
A fellow audiophile friend of mine told me about a Phono Section Break-In CD he had read about, possibly in Fremer's column, that has a very low level signal output- similar to the output of a MC cartridge. Apparently you put this disc in your CD player, plug the CD outputs into the phono section inputs and hit the repeat button. This is supposed to afford you with fast, efficient phono section break-in, particularly useful for breaking in step-up transformers. Anybody know about this item, and where to get one ?