Yamaha CS80

If I could make a suggestion to you here.

Forget about the IC's being too fast or slightly different to the 
originals. I think your barking up the wrong tree here.

This sounds to me like a physical problem created by replacing the 
IC's, and not the IC's themselves. 

When I KSR an 80 I use off the shelve new IC's, the make is of no 
concern at all. 

If you have used dil sockets for the IC's, check for bent legs, pins 
soldered together and even orientation. After doing over 60 CS80 
restorations now I can still screw it up from time to time so don't 
be offended if I sound like I'm putting your work down. 


If you like, send me a detailed list of all the problems your having 
and I will work through them with you to fix your beautiful synth (I 
do love CS80's so much).



--- In yamahacs80@yahoogroups.com, "mborish_2000" <mborish_2000@...> 
wrote:
>
> It might.  Some of the older chips took forever to switch.  I 
haven't
> seen a datasheet for the original 4000 series Toshiba IC's. I'm 
going
> to do that next.  The new 4000 series chips have much lower 
internal
> resistances.   
> 
> --- In yamahacs80@yahoogroups.com, "Quazimodo" <noddyspuncture@> 
wrote:
> >
> > Mike I just Googled and read up on it (a bit..)
> > 
> > Should you really worry... it looks like it would be in the
> > *nanosecond* region anyway.... or am I wrong..?
> > 
> > Cheers,
> > TOM
> > 
> > 
> > 
> > --- In yamahacs80@yahoogroups.com, "mborish_2000" <mborish_2000@>
> > wrote:
> > >
> > > Thanks for your help everybody.  Eventually, I am going to do a
> > > continuity check.  Right now I am worried about propagation 
delay. 
> > > I'm not going to run into any propagation delay issues if I 
keep most
> > > of the  CMOS in there am I?
> > > 
> > > -Mike
> > >
> >
>