Sony Receiver - Auto-Calibration

[toef]

I've searched these forums and all of Google to try to find an answer to my question, but had no luck.

About a year ago, I bought a used Sony receiver, which was in excellent condition, and included everything...except the auto-cal microphone.

My question is, is there a place I can order a new microphone? If not, do you know if any microphone with a 3.5mm jack will work? I've seen some Denon ones for sale, and was wondering if that will do the job, or if I can use one of the cheap mics I have sitting around for use on my computer (provided I can find where I put them).