[sdiy] Fwd: EXAR SSM chips

[chris]

I just had the old lady on the bench, to show me all she's got.
Aged sweet 44 years - what a gorgeous M*LF...

Envelope generators are genuine SSM2050s, no idea if there have been
EXAR variants.

BTW - one of the oscillators has no goo under the tempco, it's an
SSM2030.

And I just saw that there's mostly XR5101 VCAs with various date codes
in the 7820s, while there are two SSM2020s, dated 7909.

The filters are XR5099 from 7829, with a single SSM2040 from 7950.

Strangely, the SSM2050s are from 7909 and (most) 8017, somewhat later.

Some of the single different date codes may have come from repairs,
obviously at least lots of the CMOS stuff has been replaced.

While I was at it - battery still healthy at 3.3 V, but that may have
been replaced before I proposed to her some 20 years ago.

Chris



On Thu, 31 Mar 2022 12:42:00 -0700 g montalbano
<montalbanogmm at gmail.com> wrote:

> Thanks for the 2040 equivalent number.  The 5101 is their version of the
> SSM2020 dual VCA.
> ~G
> 
> On Thu, Mar 31, 2022 at 12:32 PM chris <chris at chrismusic.de> wrote:
> 
> > That mystery has been puzzling me for quite some time.
> >
> > In my rev1 the SSM2040 equivalent is Exar XR5099, and then there are
> > XR5101, don't remember what they stood for (ADSR?).
> > IIRC, the oscillator chips have some tempco stuff glued on them, so I
> > have no idea how they are labelled.
> >
> > Chris
> >
> >
> >
> > On Thu, 31 Mar 2022 10:18:00 -0700 g montalbano via Synth-diy
> > <synth-diy at synth-diy.org> wrote:
> >
> > > ---------- Forwarded message ---------
> > > From: klosmon <klosmon at sbcglobal.net>
> > > Date: Thu, Mar 31, 2022 at 10:15 AM
> > > Subject: EXAR SSM chips
> > > To: <montalbanogmm at gmail.com>
> > >
> > >
> > > Back in the day, EXAR made versions of the SSM chips in the Rev1 & 2.
> > I've
> > > seen them in the past in units I've serviced, and noticed that they had
> > > different numbers than the chips they were replacing (but stupidly didn't
> > > write down those numbers).  Does anyone here have any record of the EXAR
> > > numbers?
> > > Thanks.
> > > ~G
> >
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Christian