> I'm interested to change the ADC, DAC, and if possible the
> most importante CHIPs in the Polaris.
>
> Are they still on eBay, on I need to buy here ?

The ADC is available from various distributors, like Digikey, but the DAC
may be hard to find.

But I don't think you should change chips, especially rare or expensive
ones, in the blind hope that one will magically fix your problem. The right
thing to do is to have a technician debug the problem properly, and figure
out what's wrong by analyzing the clues in the behavior.

I don't know any repair technicians in your area, but there must be someone
who is capable of understanding how the Polaris works, and who is
experienced with a scope and other tools. The service manual has good
descriptions. I know, I wrote them. Unfortunately, they're in English, so
you would need someone who can understand technical English.

--

Ciao, Paul D. DeRocco
Paul mailto:pderocco@...