Are Dual turntables any good?

If so, what vintage? Are they tweakable?

I saw a Dual at the flea market this weekend. Should have wrote down which one it was. I'll check back next week. I'm thinking the table is from the early 80s.

Been looking around for cheap tables to tinker with and perhaps learn something.
I owned a 505-3, or was it a 503-5? Honestly don't recall but it was a nice belt drive that always peformed well. Try this web site for a lot of good info on vintage Dual tables:
I believe the 701 is the most popular and sells for the most. I have a CS-5000 but I don't use it.
Rwwear, how is the CS-5000. I have a chance to get one for $275. Is that a decent deal? It would be replacing a B&O RX turntable. Would this be a major improvement? Thanks.
If you want a belt-drive or idler wheel TT, with modern amenities like non-intrusive auto shutoff and/or quartz lock regulation, Duals are as good as they get. By the time the CS-506 and CS-5000 were being produced, Japan had gone whole hog into DD.

The older ones from the 70's (with the typical start-stop lever) had unreliable Auto start and Stop mechanisms, so make sure that is working. I've had three of them over the years, and while they look and feel a bit clunky compared to the Japanese, the sound was IMO better than the Japanese DD.

On the other hand, for a cheap basement system the Japanese TT's are much easier to find, set up, and use.
The 5000 is nice to look at but has a lot of plastic parts on the tonearm assembly and is hard to get the feet adjusted. It seems to work fine but I have never used it in my main system. It is known for being in the movie the Lair of The White Worm.