Vintage Simmons Drums (UK) Users Group

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@...>
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
>
>
>
>
>
>
>
>