[sdiy] Polymoog episode 2

[Debby and Gene Stopp]

The more I look at the keyboard bushing problem, the more I think that I'm
going to rip up another (smaller) keyboard and pull out a complete row of
metal fingers and bushings.

On the old Pratt & Reads, the fingers at the front of the keyboard (the ones
that act as guides and hold the rubber bumpers) are all part of one piece of
metal that's pop-riveted onto the front of the frame. I could drill out the
pop-rivets, and graft the row from the sacrificed keyboard onto the ailing
six-octave. This should restore the whole thing.

Fortunately the bumpers are in good shape. Many times I've seen them rot and
fall apart, rendering the keys noisey and misaligned.

I did have to replace some of the white keys, but I needed to retain the
lead weights in the originals. I found out that if I shattered the plastic
around the weight, the epoxy-blob with the lead weight inside remained in
the shape of the inside of the key. I could then force this into the new
key, with enough friction to wedge it in permanently. I was pretty happy
about that - I really didn't want to have to mix large amounts of new epoxy
because I always seem to get it all over the place. Great glue but messy.

The various chips I've been able to find on the web at various sites - I
forgot the names, but I bookmarked them. Hopefully the 726's are still good.
I even have a couple of spare 50240's. I may need more - wasn't there just a
thread about that lately? Did we find a source for those? Maybe I need to do
another google-search....

I've been studying the schematics more - they're in my travel bag so I can
read them on plane flights every week. Much better than crossword puzzles.
I'm sure my fellow passengers are getting a chuckle out of this. Just trying
to make sense of the wiring harnesses makes my brain hurt.

- Gene


----- Original Message -----
From: "The Old Crow" <oldcrow at oldcrows.net>
To: "Debby and Gene Stopp" <squarewave at jps.net>
Cc: <synth-diy at node12b53.a2000.nl>
Sent: Monday, January 29, 2001 10:34 AM
Subject: Re: [sdiy] Polymoog episode 1


>
> On Sun, 28 Jan 2001, Debby and Gene Stopp wrote:
>
> > The keyboard frame has some problems too, which I'm trying to decide
>
>   Perhaps Arcsound offers a bushing kit for Polymoogs.
>
> Crow
>
> /**/
>
>