via this auction
"Here is classic vintage polyphonic synthesizer from the best years of poly synths. The OB-X has arguably the biggest and most powerful sound thanks to it's largely discrete, pre-Curtis Electromusic era, voice architecture lifted straight out of the SEM-based systems that preceded it. The filters are supreme and, that bit of looseness in the tuning provides loads of thick and raw character, being edgy with a bottom end that is just apocalyptic in size.
The unit has just been serviced:-All of the connector/header contacts were de-oxidized throughout the entire unit.
-All solder points of the interconnect headers were re-flowed on both voice motherboards, the power supply and both the lower and upper processor boards.
-The upper tray ribbon connectors that connect to the processor board have been replaced.
-The +19 volt and -19 volt adjustment trimmers on the power supply have been replaced with multi-turn, high-precision trimmers.
-The entire unit has had a full calibration according to the original service manual.
-Loaded with original factory patches."
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