Thanks MacGeek, great tips, especially the pencil eraser. I like learning as much as I can about this stuff. Lots of great old stuff out there that is deserving of continued use. Since I don't have a lot of the basic electronics training I've been trying to go through some online training.
I tried one more thing. These old Pioneers have a voltage selector on the rear. 110, 117, 130, up to 230 I believe. I tried the first three, when I tried the 130 things settled down a great deal. Phono has a bit of ground hum up about 75% volume, which is way too loud to listen to at that level. AUX is almost dead silent, slight white noise over 50%. Tape is noisy as all hell at any volume, but no plans for tape listening anyhow. We'll see how it reacts to getting more use, but for now it's a rocking little unit.