[sdiy] Juno-106 replacement filters

[Luís Marka]

Actually the chips themselves should be fine even in bad 80017A modules. 
What seems to happen is that over time the epoxy material reacts with 
the material used for the printed resistors deposited on the ceramic 
substrate, causing corrosion, and this corrosion leads to noisy modules. 
It should be possible to fix a module by cutting out the corroded 
portion(s) and soldering SMD resistors in their place.

> I always thought that the epoxy on the voice modules is causing 
> overheating and that is what causes the slow death of the rare 
> unobtaniums custom ICs underneath.
>
> I'm still investigating on this, probably after restoring
>
>
>
> 2017-11-29 20:05 GMT+01:00 MTG <grant at musictechnologiesgroup.com 
> <mailto:grant at musictechnologiesgroup.com>>:
>
>     It would be nice to find out what the definitive "fix" is for
>     these, aside from replacement.  I've seen discussions talking
>     about arbitrary acetone soaking.  Other ones discussing the length
>     of time depending on the date code, and yet another discussing
>     that it's not the acetone at all, it's the board level resoldering
>     you have to do afterward.
>
>     I have an MKS30 waiting for me.
>
>
>
>     On 11/29/2017 10:53 AM, NSSINC wrote:
>
>
>              I like fixing stuff. I like the Juno-106. But I have
>         grown tired of fixing my brother's 106 every few months. We
>         don't even bother calibrating it anymore.
>
>              So I'm looking for list members opinions of this guys
>         replacement filter chips:
>
>         http://www.analoguerenaissance.com/AR80017A/
>         <http://www.analoguerenaissance.com/AR80017A/>
>
>              And if anyone in the US has opinions on weather it's
>         better to order direct or from Syntaur.
>
>
>         Thanks!
>
>         -Al
>
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