And the verdict is.....It's running too fast. I'll have to go into the Service Manual and see how to check and adjust the speed. I tried several of the recorded tapes "The Colonel" gave me, including the Bob Hope tape after I was sure the deck wouldn't eat it, and they sound like Alvin and the Chipmunks. I recorded some songs from a local FM station using the Pioneer receiver at both 3-3/4ips and 7-1/2ips, and they play back great, so some components or adjustments have shifted between when the tapes were made on this deck and now.
You can tell it's Bob Hope talking, but the tape is sped up to the point that it's not really listenable.
I looked up some of the artists whose names are listed on the tapes, and they're mostly from the 1930's and 40's, swing, and big-band stuff. And a couple of the artists had notes on their bios that all their master recordings were destroyed in the 2008 Universal Studios Fire. I don't think these tapes are "valuable", but I'll ask around on some of the vintage tape forums.
So the radio and speakers work fine, and I can play records on the turntable without crazy feedback, and if I make my own recordings, I can play them back fine, but to me, the deck still has a problem.