[sdiy] Key spring colors on ARP synths

[Maarten]

There are several color variants of the springs. If I came across  blue 
and brownish ones. I am not sure if the colors where used for specific 
variants of the keyboards. There are at least two keyboard variants, the 
one with the metal key holders and the one with the completely plastic 
keys. There is a slight difference in length of the springs.  When I 
take a keyboard apart I sort the springs and when assembling the 
keyboard I start with the black keys which is the lowest amount of keys 
and thus springs.

Yes there was a tool, you can see a part of it in the service manual of 
the Moog Micro and Multimoog service manual. I made one myself and it 
makes aligning keyboards much easier.

Best,
Maarten

Op 3-2-2025 om 16:35 schreef Benjamín Velasco via Synth-diy:
> Slightly OT.
>
> I think I once read about a specific tool for leveling those Pratt 
> Read keyboards that allowed pushing/pulling the bushings posts without 
> having to remove the keys. Or did I dream this tool existed?
>
> El dom, 2 feb 2025 a las 20:39, <tamedogs at wildcats.com> escribió:
>
>     I worked there from early 1974 to late 1980.
>     Keyboards came from pratt-read. They came out of the crates, a guy
>     named
>     Gene buffed the keys and into the units they went. I never heard
>     anyone ever
>     talk about spring colors.
>
>     Dana
>
>     -----Original Message-----
>     From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf
>     Of Terje
>     Winther
>     Sent: Sunday, February 2, 2025 4:36 PM
>     To: David G Dixon via Synth-diy <Synth-diy at synth-diy.org>
>     Subject: [sdiy] Key spring colors on ARP synths
>
>     Recently I have fixed some old ARP synths. They all needed a
>     really good
>     cleaning of the keyboard. And as you know; you need to remove
>     those key
>     springs to change key bushings and various other fixes.
>     The key springs have two colors; black and (dark) red. Supposedly
>     because of
>     different tensions for the white and black keys, since they have
>     slightly
>     different horizontal travel.
>
>     But here is where it gets strange:
>     Some of the synths I have fixed used black springs for black keys
>     (sort of
>     easy to remember), while other synths used the red ones for the
>     black keys.
>     So which is correct? Or did ARP change this according to any sort of
>     differences between the various versions of the Axxe and Odyssey etc.?
>
>     Anyone?
>
>
>
>     Terje Winther
>     terje.winther at wintherstormer.no
>     http://wintherstormer.no/
>
>
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> -- 
> *Benjamín Velasco Ossandón*
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