Here's some pics of a Pioneer SX-780 I rescued at a garage sale for $5. Good think I didn't turn it on until I opened it up - I wonder if it would have started on fire from all the dust in there!
Note the 3rd 'clean' pic is not mine - from the web. I can't find a clean pic of my personal 780 for some reason, though I insist it looked mint! :)
It worked perfectly (and sounded great) after a cleaning. I traded it for a set of refoamed Boston A100s.