The Juno-106's days are numbered. There was a design flaw that made a critical chip fail over time. The Juno-106 was made between 1984 and 86 with around 40,000 produced. Unfortunately most 106s I come across now have one or more faulty chips that make a voice hang or crackle. The chip was a custom chip that Roland manufactured called a 80017a.
The 80017a was a voltage controlled filter with with a VCA built on a chip. Because of demand for them, pulls go for $70us + on eBay. There is little info on this problem chip, except a basic schematic. (pictured)
What you have is 3 chips on a single chip, a IR3109 and 2 BA662's. This was the exact design that was used on the Juno 60 just in a different package.
There are two clones on the market to replace your dead chips.
D'naab's
Synth Restore
The clones are a little pricey and if you wanted to replace all six voices that would almost be the same price of a beat up 106 but at least you don't have to worry about replacing the chips as the cloned 80017a do not have the same flaw.
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