Vintage Synth Repair

It should be easy to find. I've worked on a few Q's.


If it's a few keys bunched together only, then I'd suggest the Transistor array that does the simple envelopes.


What are the keys distorted?


Sent from my phone while driving.


> On 17 Sep 2014, at 10:25 am, "'Lorne Hammond' lhammond@... [vintagesynthrepair]" <vintagesynthrepair@yahoogroups.com> wrote:
>
> so its a divide down from those notes? ie c in both octaves and the note next to it?
>
> could be at source.  Or are those notes  summed together?
>
>  

>
> lastly the quadra is a weird keyboard mechanism with an up and a down connect might be the IC for the key:
>
>
>
> Read this:  http://forum.moogmusic.com/viewtopic.php?f=1&t=13154
>
>
>
> Lorne
>
>
>
>
> From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com]
> Sent: September-15-14 2:11 PM
> To: vintagesynthrepair@yahoogroups.com
> Subject: [vintagesynthrepair] ARP Quadra distortion on strings help (ARP Omni ciruitry)
>
>
>
>
>
> 'm getting a distorted and out of tune sound on the same four notes in two octaves. I have no idea where to start troubleshooting, so any suggestions are helpful. It is more prominent in the 4' range, although audible in the 8' as well. There are three other notes that are distorted only in one octave and only in the 4' range, although not nearly as noticeable.
>
> ARP Quadra poly section is based on (and the same as, afaik except for keyboard triggering)  the ARP Omni. The Quadra has one more octave, altnough the schematic is the same, so I'm not clear on that. I So any tips on the Omni should apply here.
>
>
>
> This is one of two faults I'm afraid....
>
>
>
> Tjhanks
>
>
>