[sdiy] Polymoog

[Tony Allgood]

Hi Gene, Florian, Harry and all,

Gene>Anyway, under the channel, on the rocker arm, is a rubber button
which provides the contact point between the channel and rocker arm. On
my Polymoog, a lot of these were gooey with some sticky greasy
substance, kind of like a combination of pancake syrup and vaseline.

Thanks for that Gene. You are indeed correct. This is the source of my
polymoog's heavy keyboard action. And its a right mess under there. I
have decided to remove every key in turn and give it a good seeing to.
Its going to take some time, but this mess is terrible. And once you get
the keyboard actually out of the machine, its not so bad a job. But I
now know why the Polymoog weighs so much. The keyboard assembly alone
must take up to 40% of the total weight. Each key has been filled with
lead. Incredible.

Florian>Mine lies down with one broken top octave generator...

Go to your nearest organ repairer. He'll have loads spare. Do a web
search on M083 which is a common enough TOG chip, that can be made with
a little help to fill your TOG needs. It was an Italian made chip so
should be around in many places.

I have been meaning to do a SMD hybrid version of the six stage divider
chip found in these things. The MM5823 is found in many organs and I
need them fairly regularly.

>did you have troubles with the seating of the voice cards?

Yes, I have one really bad socket, but I haven't taken it out yet to see
if the fault actually lies under the PCB.

I am taking photos as I go along, so one day I'll pop them up on my
website....

Work hardening of barb wire... well, I never knew that. Harry, you are a
mine of useful information.

Regards,

Tony Allgood, Penrith, Cumbria, England

Oakley Modular Synth and TB3030:
www.oakleysound.com/projects.htm
My music: www.mp3.com/taklamakan