Vintage Simmons Drums (UK) Users Group

Thanks for the info

I believe the chips have been taken for use elsewhere.  There are 
switches missing which look like they have been taken to repair 
something else, so I kind of think this may have been the case with 
the chips.  DOes anyone have a source for the CEM3394 ?

One other thing I`ve noticed is that there is an orange wire coming 
from the PSU board on one corner.  The other end has become 
detached.  Does anyone know where this should connect to ?

Steve, The diagrams would be useful.  I`m based in the UK. I don`t 
know if thats too far away.

thanks again 
regards Rob

--- In Simmons_Drums@yahoogroups.com, <jesper@e...> wrote:
> Yes, either the chips were blown out of their sockets or someone de-
soldered 
> them and earned big bucks on Ebay!
> 
> electronically yours, jesper
> - -- --- ---- ----- ---- --- -- -
> www.electronic-obsession.se
> 
> 
> ----- Original Message ----- 
> From: "Steve Ridley" <spr@s...>
> To: <Simmons_Drums@yahoogroups.com>
> Sent: Tuesday, September 20, 2005 2:13 PM
> Subject: RE: [Simmons Drums] Re: sds9 info wanted
> 
> 
> >
> >> The chips that are missing are marked iC37 & IC38. Can anyone 
verify
> >> that these are curtis chips & what the curtis part number is ?
> >
> > They're Curtis CEM3394s.  There should be one for each tom.  Does 
one of 
> > the
> > toms work?  There is also a CEM3372, but that's a filter for the 
snare.
> > CEM3394s are not easy to find.  Paul "MOTM" Schreiber keeps most 
Curtis 
> > chips,
> > but he's out of 3394s.  You should be able to get the data sheet 
off his 
> > site
> > though.
> >
> > Do you know why the 3394s were removed?  Before you replace them, 
check 
> > the
> > power supply.  Curtis chips are very vulnerable to excess 
voltage.  The
> > PSU should give +15v, +5v and -6.5v.  I had a PSU go bad in an 
SDS1000
> > (cut down SDS9 in a rack), and it took out the Curtis chips and a 
random
> > selection of other devices.  Sound familiar?
> >
> > I have schematics, but my scanner is dying.  If you're not too 
far away, I
> > might consider photocopying and posting them for you...
> >
> >
> > Steve
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
> >