via this auction
"These are rare synthesizers, and even more rare, are ones that work. The Quadra is loaded with sensitive logic circuits, CMOS parts, and tantalum capacitors that number in the hundreds. Replacing only the capacitors in the Quadra is not enough. Other Quadras on Ebay have not been rechipped, which means that all of the unreliable CMOS parts will fail one at a time over the coming years. This synth has been fully refurbished and no expense has been spared. We have spent countless hours restoring this synthesizer to like new condition. A custom 5 octave touch sensor was installed to give aftertouch capability over the entire range of the keyboard. We have also added mahogany sides to the case of the Quadra. It would be difficult to find a Quadra in better condition than this one.
This item weighs around 90 pounds when shipped in its case. It will ship via UPS 2nd Day Air. The dimensions of the box will be roughly 50"x30"x16".
All electrolytic capacitors replaced
All sliders cleaned and any bad ones replaced.
New custom mahogany end pieces.
All CMOS logic chips replaced and most linear IC's replaced. (Over 130 chips replaced )
New D/A converter
New RAM chip. Factory presets saved to memory.
Brand new custom NEA touch sensor that spans entire 5 octave keyboard.
All J-wires and bus bars polished, All key bushings replaced./li>
4075 filters modified (late 70's engineering revision to increase frequency response of filter.)"
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