Yamaha CS80

Holiday is fine! Soon back to restoring a cs-60 and replacing all 
trimmers with new... phew!

Sounds like it could be an external cv input  for the vcf cutoff, plain 
and simple.  I had a a four voice which had a ribbon cable installed 
with a d-sub for external cv/gate.

Fredrik Segerfalk
www.analogsweden.com
www.segerfalk.com



David skrev 2010-12-29 03:16:
>
> Hi all.
>
> Hoping you're having/had/will have some great holidays. Don't forget 
> that amazing holiday song featuring tons of CS80 by a certain ex-Beatle.
> OK, do forget it. Sorry for even bringing it up.
>
> Anyway, I'm working on a CS80 and found remnants of a mod that had 
> been removed and wondered if anyone knew what it was. There's a ribbon 
> cable with a wire going to each M board for channel I. The wire goes 
> to two sky-wired resistors that drive the F1 and F2 pads for 
> controlling the filters' cutoffs. They are 56k and 26k, which is about 
> the same ratio but half the values (so double the sensitivity) as the 
> resistors from the filter E.G. to the same points.
>
> Any idea what would have driven this and why? I'm planning to remove 
> all the resistors and wires unless there's some amazing reason to 
> leave them.
>
> David
>



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