via this auction
"This is one of the last 100 made and has all of the factory enhancements and modifications that were made through the production run. It has also had all new divider chips (and sockets added) along with having most all the CMOS chips replaced along with most all the opamps. Replaced about 3/4's of the transistors too. The dividers and CMOS chips were a major source of failure in the originals so I wanted to replace them all to make it much more reliable. All the LEDs have been replaced with ones that take less current (but look the same) so strain is taken off the power supply. The Ua726 reference oscillators have been replaced with brand new ones. Needless to say, a lot of work has been put into this polymoog and it is about 99% functional. Only issue is that the VCF filter attack and decay are not working correctly and one key needs a bushing (currently taped to make it level, as you can see in the picture. the key DOES work). It works, it just doesn't sit right and level with the other keys. I will also throw in some spare parts including chips and polycom cards."
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