via this auction
"The OB-Xa was released in December 1980, a year after the OB-X was released. Instead of discrete circuits for oscillators and filters, the OB-Xa (and the Oberheim synths to follow) switched to Curtis integrated circuits. This made the inside of the synth less cluttered, facilitating troubleshooting, and reducing the cost of manufacture. It was getting more difficult to service the OB-Xa due to the scarcity of Curtis chips; however, Curtis started re-manufacturing some of these chips in June 2016,[3] which has breathed new life into the longevity of the OB-Xa and many other synthesizers that use these chips. There are a couple of knobs missing but everything works really well and it sounds like a dream." DE10457
This was listed on Dallas Craigslist on Monday, July 1. I messaged the seller and we were supposed to meet up Tuesday after he got off work. Tuesday evening he messages me stating it's already sold. Typical CL BS.
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