via this auction
"Korg Poly-800 8-Voice Programmable Synthesizer with Original padded Korg Flight Case
also included: Korg factory presert .WAV patches on CD (no need to use cassette tape player),
1/8" mini-jack mono patch cord, 9 volt AC wall adapter.
This is an early Poly-800 (serial number 0004922). That means it's a better Korg Poly-800. Here's why:
The first wave of Korg Poly-800s were originally manufactured without a battery soldered to the circuit board. This early serial number Poly-800 is one of the models without the leaky internal batteries. That means the circuit boards on this synthesizer are perfect and unharmed.The later Poly-800s and Poly-800 MkII models had a battery soldered to the board to help hold the software sound patches in memory, and after 26 years, most have leaked corrosive battery acid on the boards. But not this one! No circuit board battery, so no circuit board damage. Look at the photos. The boards are perfect."
Inside a KORG Poly-800
That's also not to mention that sitting with 6 D batteries in the case to maintain the memory doesn't cause the same problems.
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