Vintage Simmons Drums (UK) Users Group

I'd suggest buying a complete working SDS-9 is worth more than the trouble - 
use this for spares!

electronically yours, jesper
- -- --- ---- ----- ---- --- -- -
www.electronic-obsession.se


----- Original Message ----- 
From: "flinnrob" <flinnrob@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Tuesday, September 20, 2005 8:02 PM
Subject: [Simmons Drums] Re: sds9 info wanted


> Having had another look the 3rd 3394 is also missing.
>
> --- In Simmons_Drums@yahoogroups.com, Steve Ridley <spr@s...> wrote:
>>
>> > 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
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