Phono Inputs...what can I use them for?

Well now. I'm glad we're all clear on that point.

Even if I don't understand what any of you just said.
What's "Gain"? What's RIAA equalization? Awwww...It doesn't matter.

Okay, here's another stupid question: Since I'll never use vinyl again, could I take it to a guy that knows component level repair? Could he take the thing apart and turn one of the remaining phono inputs into something useable? Something I could plug a TV or MP3 player into?

If you really need extra inputs an external box would probably be cheaper and not require any change to the unit. You would destroy most of the resale value by rewiring it.

I think Viridian's and Stan's suggestions are good. To explain what Elizabeth and I were saying, generally a phono stage is used to accept a very low level, comparatively weak, signal from a phono cartridge and amplify that signal. Thus , there is an amplification stage in the phono stage that, were you to feed it a signal that is too strong, would overload the unit. The RIAA equalization is also built into a phono stage--records were intentionally cut with reduced low frequencies so they could be cut on the record and played back by a stylus (I'm oversimplifying--I'm sure other frequencies were intentionally changed during the cutting of the record)--the phono stage has a built in equalizer to attempt to restore the frequencies to what they were on the master tape. If you play back a source like a CD that was not "reverse equalized" like a record was, it will skew the frequency response of the music on the CD.

Good answers.I like the separate input box idea too.