diskseacup
You've done a great thing, not only did you buy a bass you bought a Peavey Bass.
Obviously you're a man of taste.
I am, indeed, a man of taste. Exceptionally questionable taste, most would say, but taste none-the-same.
They make a product called Deoxit contact cleaner that I have used on dirty pots. However, if memory serves, the preamp in dyna basses are circuitboard bound, so accessing the pots may be some hassle. You likely have an amazing bass that just needs some love to get back up and running. I would take it to a tech if I were you, but I'm not the most competent at repairs myself, so your mileage may vary. Welcome to the world of bass!
Contact cleaner was my first thought, but I don't happen to have any handy. I wouldn't trust the techs at the only music store in my podunk little town to change a set of strings, let alone setup a guitar. Or a bass for that matter. BTDT.
dickseacup - a pic of your bass is the only requirement for membership. So let's see it!
A picture? Is that all? I was worried you'd make me play something on it! HAHA. Although, for kicks I plugged it in to the kids' Rocksmith and got my ass kicked by "Roadhouse Blues" (in my defense, I did manage 93% accuracy on 100% difficulty, but I have no idea if my fingering technique is correct, lol). "Where is My Mind" was a bit easier (95% accuracy! woohoo!) and I had a blast with those sort of rolling, two-fingers-required 1/8th (or 1/16th; 220, 221 whatever it takes...) notes.
Here's a pic down in the Basement Club, with the house lights up all the way. Forgive the quality, I took it with a potato:
(no, it's not plugged in to that amp; that rare Heritage is, though)
So, couple of quick questions:
How close to the strings should the pups be? The bass side of the P (I hope I have that right, the split one) pickup is about flush with the top; while the treble side is up about 1/4" or maybe 5/16" higher. The J pup is up about 3/8" from flush and level. Looking at it, that seems low to me, but what do I know?
What is safe to clean this thing with as far as the finish? Is it tung oiled? It seems like a hand rubbed finish to me that has never gotten any real attention. I mean, you can feel the grain and all, so I don't think it's been messed with since the factory.
Oh, and lastly, where in the heck am I supposed to anchor my thumb when playing bass? I mean, I was watching MTV back in the late 80s and I've seen a few concerts and youtube videos. Do you just drop it on top of a pickup ear? I know, total newbie question, please forgive me.