KORG Polysix

images via this auction

Note this one has the faulty battery problem.

"This Poly 6 has the common problem ALL POLY6 Keyboards Do. A leaked battery spills onto the circuit board next to the battery terminal and causes the keyboard to stop working and not power up...

Here is some excellent tech information about this battery problem @ these links:
inspection.html
repair.html
keyclean.html
miniserv.html"

Korg Radias

via this auction

ARP Odyssey II

images via this auction