Strange source for SSM2040 ICs?

[BJ]

Gavin Muir wrote:
> 
> Hi all,
> 
>         This is my second posting, so before I get to the point, thanks to those
> who wrote in regards to my question on the SSM2040 and 2020 circuits.
> 
>         On this same track, I performed a search awhile back and noticed that
> there is a catalogue offering SSM 2040 Ics (incorrectly labelled as a VCO,
> but corrected elsewhere as a VCF). On a hunch I picked one up (along with a
> 2020), and was a bit surprised at what I got.
> 
>         Apparently Thomas Organs used to do some contract work for Moog or
> something, and somehow the SSM chips eventually got used in some of their
> products. What I got was a clearly marked SSM 2020, but also an oddly
> marked IC with a Thomas parts number on it - 5099. I phoned and asked about
> this, and apparently this is supposed to be a 2040, only it has been
> screened with the Thomas parts number instead of the usual SSM2040. I don't
> really have a circuit to test these in (I'm not putting this in a
> synthesizer to test it thank you!),  so I was just wondering whether or not
> anyone else had found this site or tested one of these chips? Is it fairly
> normal for such chips to be re-screened by a manufacturer? Any ideas on a
> quick circuit which I could use to test this IC?
> 
> Cheers,
> Gavin Muir
> 
> P.S. I'm still looking for a basic VCA circuit for the 2020 if anyone can
> point me towards one!

Whats the name and URL for the catalogue?
It might be a source for SSM2040 VCF's

BJ