"don't forget that the D#4-E4 adjustment may fix this"
What's this fix you speak of? I must have been asleep when the memo went out ;)
thanks
To:
PolySix@yahoogroups.comFrom:
backshall1@bellsouth.netDate: Fri, 23 Jul 2010 14:14:14 +0000
Subject: [PolySix] Re: Tuning problems
This sure seems to be a summertime problem. I've got one doing the same thing. It was fine all winter. Since the Polysix gets so hot inside anyway, maybe it's a humidity problem, not heat? It eventually tunes up fairly well, but can take 30 minutes instead of 2.
I've improved that somewhat with a lot of cleaning. I don't think there's anything wrong with the capacitors, but a bit of crud on the board can cause much strangeness. The whole board seems a bit sticky, like it's covered in old solder flux. I imagine old flux would be hard as enamel after the original solder bath, but may be getting gooey after a few decades and dust and dirt is sticking to it. I got some definite improvements cleaning around Q8,9,10,11 of the bad voice. Deoxit by itself seems to loosen things up but not remove anything. My old toothbrush didn't quite seem to get the job done, so I got a new fiberglass "scratch" pencil brush. Makes a bit of dust with the tips of the glass fibers breaking off constantly, so keep a vacuum handy.
If you've got scaling problems with lower octaves okay but upper octave stretched, don't forget that the D#4-E4 adjustment may fix this. Go lightly when adjusting it, though, and set it for best results when switched to 4' range, not 16'. I doubt if the Polysix could ever be perfectly tuned even when new. It's all compromises, trying to get everything within a few cents in all ranges. Besides, any professional piano tuner will tell you that "perfect" tuning sounds like crap.
Don B.
--- In PolySix@yahoogroups.com, Paul T <sharpfish@...> wrote:
>
>
> Mine's doing this now too. I think i read somewhere that bad capacitors could throw out a voice unit (because I tried switching chips between voices and tuning it and never got that 1 voice 100%) - however I think my whole synth needs another re-tune as it's now off over the octaves on all voices (iirc not played it for a while)
> Obviously let it warm up before tuning also which you probably did.
> If anyone has a checklist for replacing the caps, and the PSU caps and general overhaul (not just the calibration and tuning giving in the service manual) let me know thanks :)
>
>
> To: PolySix@yahoogroups.com
> From: lukaslundh@...
> Date: Sat, 17 Jul 2010 06:12:33 +0000
> Subject: [PolySix] Tuning problems
>
>
> Hi, I'm new to this group and this is my first message.
>
> I recently got a Polysix (about 2 months ago). Everything was working fine with my unit but about a week ago one of the voices had drifted out of tune. I opened up the synth and tried to tune it with the help of my brother, who is a bit more knowledgable about electronics than I am, and with the help of the service manual.
>
>
>
> I tried tuning the voice but no matter what I did I couldn't get it in tune over the different octaves. If it's in tune in the higher octave it sounds like crap in the lower and vice versa. I know there is two resistors to turn, the Tune High and Tune Low, but I don't really know what I'm doing when I'm turning these. Following the instructions of tuning in the service manual got it even worse out of tune. So I don't really know what to do.
>
>
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> Maybe I'm doing something completely wrong, I don't know. I've tried getting info on this on the web but with no luck. So now I turn to you.
>
> Maybe someone can help me with my problem? It would be greatly appriciated.
>
>
>
> /Lukas
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>
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