OldSynths

I'm probably gonna work on my CS80 again this weekend. The poor
beast is terribly out of tune as it hasn't really been played in
about 2 years.

Here's how I'm doing the tuning. I synthesized some sign waves using
a old copy of Sound Forge XP and play these into my mixer in loop
mode.  I get a perfect A440 or whatever this way.

Then I pop open my baby and attack the trimmers.  Takes hours this
way. I'm counting the beats but the trimmers are wacky on account
their max position is almost within a few cents but darn it, I just
can't get it.  So, I'm thinking I might try adjusting the master
tuner fader to see if I can get the trimmers "centered".

I really need a good Frequency Counter but I'm almost afraid to buy
one because all I'll be using it for is to tune. Is there such a
thing as a tuner for Electronics? (the idea of using a guitar tuner
is insane to me although to be honest, I've never tried).

If you've got any advice for me, it'd be great.  I've one channel of
the CS80 tuned (stills sounds bad, though) and I'm not looking
forward doing the other channel at all.

Cheers!

Scott L Holmes


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> Have you looked at:
> http://www.oldcrows.net/~oldcrow/synth/yamaha/cs80/

On Thu, 22 Jan 2004, Scott L. Holmes wrote:

> --- In oldsynths@yahoogroups.com, greg montalbano
> <greg.montalbano@u...> wrote:
> > Have you looked at:
> > http://www.oldcrows.net/~oldcrow/synth/yamaha/cs80/
>
> Greg, yes. And a matter of fact I posted this link in our group's
> link page. Very good stuff there. He just doesn't go into much
> detail about the actual tuning (although he's got great advice on
> how to locate which "Voice" you're on.)
>
> Thanks. BTW I also posted a link to the service manual although the
> one at that site is very much different from my paper original -
> mine looks revised.

--- In oldsynths@yahoogroups.com, The Old Crow <oldcrow@o...> wrote:

OMG!

> I should really add more about tuning, I suppose.
> The main problem with
> tuning is Yamaha used the cheapest single-turn
> trimmers imaginable and the
> settings are overly sensitive. I've replaced all the
> trimmers on my CS-80
> (this is a very tedious and lengthy task, be forewarned!)
> with multi-turn
> trimmers which makes tuning much, much easier.

OMG!

> I've seen that there are several revisions of service manual.
> I have two, one from 1977 and one from 1981, and there are
> minor differences.
> And typos in both...

I'll try to remember to look at mine and let you know more about it.

Thanks a bunch Scott. Needless to say, I'm not going to replace my
trimmers any time soon - not without practicing with the old
soldering iron first - for about 2 weeks straight! I used to be
pretty darn good with the iron but that was in the early 80s and
have since concentrated on making money to pay folks to do that!

Cheers!

Scott

>
> I should really add more about tuning, I suppose. The main