More or less all of them are 85-87 except on the PSU board where there are
79-circuitry.
electronically yours, jesper
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----- Original Message -----
From: "Steve Ridley" <spr@...>
To: <Simmons_Drums@yahoogroups.com>
Sent: Friday, September 21, 2007 12:13 PM
Subject: Re: [Simmons Drums] sds-2, pics and sounds
>> Here is a mystery to be solved. It looks like the SDS-2 I have is of
>> later
>> date and maybe not of Simmons origin after all, but all other stuff
>> corresponds to the description so it gets me thinking that the original
>> electronic design might have faltered and was replaced.
>
> Have you looked at the bottom side of the voice boards?
> It's common to etch a make or model number along with
> the copper tracks.
>
> Also, if you cad take a better pic of the top of the board,
> I may be able to read date codes off the ICs. Then at least
> you'll know if the whole thing is from 1983. There's always
> a chance that a better headphone amp died and got replaced
> later...
>
>
> Steve
>
>