[Coco] Speech Systems Symphony 12 & Piano attachment

[Robert Emery]

One could "tone out" the continuity with a meter, no? Map it out pin by pin

On Tue, Aug 12, 2025, 5:06 PM RETRO Innovations via Coco <
coco at maltedmedia.com> wrote:

> On 8/12/2025 3:57 PM, Rob Rosenbrock via Coco wrote:
> > On 2025-08-12 4:02 pm, RETRO Innovations via Coco wrote:
> >> What would also be nice is a pic of the top of an actual SS Stereo
> >> Pak, with the extra ICs identified and the resistor values shown. If
> >> a repro PCB is in the cards, it seems like it should support both use
> >> cases.
> >>
> >> Jim
> >
> >
> > I took some pictures from my board, but they're no better than what is
> > on the FB page. Removing the ICs didn't help much, either, since the
> > sockets cover most of the traces. I think it'd be easier if someone
> > were to draw out the circuit in CAD. (I don't know when I can get to it)
> Well, that's what I was going to do, but having a clean board makes it
> much easier.  Sometimes, traces are hidden under the sockets, so the
> only way to see the connections is to strip the PCB.
> >
> > The cap is labelled as 104z. I think it's safe to say that it is just
> > a bypass cap.
> Yep, .1uF
> >
> >
> If you email me the top pics with the IC's removed, that might help a
> bit.  But, if anyone has a unit they'd be OK with me removing and
> replacing the sockets, that would be grand.
>
> Jim
>
>
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