Update: Schematics in hand... :)
Yes, the channels share the noise source and I bet that's bananas since
it's located just below the preset switch board and above where the bent
damage was the worst. Since it's only one IC with a few basic components
around it I might just change the IC and hope that solves it... I might
even have the correct IC with a bit of luck.
Q 2-4 semi-solved. Q 1 still open... though the demos on youtube seem to
indicate my suspicion is correct.
--
electronically yours, jesper
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www.electronic-obsession.se
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Angaudlinn on iTunes:
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https://www.facebook.com/AngaudlinnDen 2016-04-21 kl. 16:05, skrev jesper
jesper@... [Simmons_Drums]:
> Hi list,
>
> I put the sold-as-broken-SDS-8 on the bench today, rigged it to a PSU
> and it lit up (to my surprise) as they're supposed to. Fiddling with the
> controls I came to the conclusion that the presets sound messed up
> indeed. A sort of metallic floor tom sound dominating all, though they
> differ in length and somewhat in pitch. But forget the disco toms I
> remember being there from scratch.
>
> Putting it in user mode everything seems to work basically as I recall
> it should (reminding me of why I sold every single one I've come
> across). But a few Q's arose:
>
> 1. Is the bend up not as wide in the frequency spectrum as bend down? (I
> can imagine not since the bend down effect was the desired one at the time)
> 2. How is noise supposed to sound? (I think it's a white noise burst...
> but it's not available here in any case)
> 3. That noise, is it shared among all the channels? (That could explain
> a lot!)
> 4. Any schematics available on this sucker? (I haven't found any online)
>
> Anyway, I'm surprised it was working this well. But thinking of how the
> case looked yesterday I can imagine that shorting all kinds of things on
> the board if the former owner just plugged it in as it were.
>
> I hope to get this back in decent shape. It's always fun to save and
> protect the Simmons legacy, even though I doubt I'll keep the SDS-8...
>