[sdiy] Siel opera6 schematics

[damsagain at free.fr]

Hi everybody,

My english is very poor excuse me.

Tom, Ulrich, Yves, ASSI, Neil, Scott, Andre and Bob (hope I forgot nobody) I
would like to say thank you ! Thank you for your answers, for your advices, for
allowing me to make a choice... thank you !

It was my first post maybe not the last. I don't know. But I kown there is cool
people in this mailing list !

I decided it was not a good idea to buy the Siel given the DCO were missing...

So I always search a polyphonic and analogic syntheziser... Why not a Polysix so
?
It seems to be a really good machine, but quite expensive !
Maybe one day I would be lucky.
:)

Regards,
Damien




Selon Tom Wiltshire <tom at electricdruid.net>:

> Damian,
>
> There are Opera6 schematics available somewhere, 'cos I've got a
> copy. Furthermore, the quality is pretty good - way better than some
> of the unreadable rubbish you find online (JX3P?!).
>   It's one of the ones I've been looking at whilst thinking about DCOs.
> If you don't find it anywhere (or can't be bothered to look), I'll
> send it to you.
>
> To determine whether the synth is repairable, you'd need to know
> which ICs have been removed. The design has 8253 counter-based DCOs,
> followed by SSM2044 filter and SSM2024 quad VCA, controlled by a
> SSM2056 Envelope generator per voice. It's very similar to the Korg
> Polysix (except that had VCOs) or the Poly61.
>
> If someone thought the synth wasn't a viable repair, they might well
> have removed the valuable SSMs to sell. You could probably cover the
> cost of the synth like that. The SSM2044 filters are still available,
> but the envelope generators might be hard to find. Alternatively,
> find a dead Polysix (not hard - they die all the time) that hasn't
> been stripped and use that for parts.
>
> Regards,
> Tom
>
> On 17 Dec 2008, at 13:17, damsagain at free.fr wrote:
>
> > Hi everybody,
> >
> > I was searching a vintage Siel Opera 6 Analogic synthesizer when I
> > found an ad
> > about it but the seller said to me that I would have to restore it.
> > Indeed he told me that integrated circuits missed on his Opera 6.
> > So I have a question :
> > - Does Siel Opera 6 schematics exist ?
> > I search on the web but I found nothing.
> >
> > However I wonder :  Does it a good idea trying to fix that
> > synthesizer while I
> > don't really know why IC have been removed ?
> >
> > :-/
> > Thank you for your interest.
> > Best regards,
> > Damien
> >
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>
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