Re: [AH] Jupiter 8 bizarre tuning problem

From Mark Spano
Sent Mon, Feb 24th 2014, 15:30

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Could be dirty pots for the oscillator value or master fine tune? I've had
some definite tuning weirdness happen when these pots are dirty - sounds
like bad modern day autotune.


On Mon, Feb 24, 2014 at 8:32 AM, System 100m <redacted@example.com> wrote:

> My stock JP8 is starting to give it's signs of age. I usually recap every
> vintage synth I get but this time I wanted to keep it untouched.
>
> The problem it shows is intermittent, meaning it would most of the time
> power up, tune and play perfectly,
> but last time I moved it I would power it up and the oscillators would be
> out of tune (when this doesn't occur they are almost perfectly tuned even
> without hitting the Tune button).
>
>  In that case when I hit the Tune button, it will cause a *mess* in the
> tuning rather than fixing the tuning -
> first few notes in the octave would be in the correct scale but the half
> top notes in all octaves will play in a different scale !
>
> I also noted that in the same case the overall pitch would sometimes go up
> and done a few semitones.
>
> Again, most of the times it would power up, tune and play perfectly. No
> need to get it warm or anything else...
>
> Is that an issue anyone ever came across with ? Any suggestions except for
> checking the connectors ?
>
> Thanks !!
>

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<div dir=3D"ltr">Could be dirty pots for the oscillator value or master fin=
e tune? I&#39;ve had some definite tuning weirdness happen when these pots =
are dirty - sounds like bad modern day autotune.<br></div><div class=3D"gma=
il_extra">

<br><br><div class=3D"gmail_quote">On Mon, Feb 24, 2014 at 8:32 AM, System =
100m <span dir=3D"ltr">&lt;<a href=3D"mailto:redacted@example.com" target=
=3D"_blank">redacted@example.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">

<div dir=3D"rtl"><div dir=3D"ltr">My stock JP8 is starting to give it&#39;s=
 signs of age. I usually recap every vintage synth I get but this time I wa=
nted to keep it untouched.<br><br></div><div dir=3D"ltr">The problem it sho=
ws is intermittent, meaning it would most of the time power up, tune and pl=
ay perfectly,<br>


</div><div dir=3D"ltr">but last time I moved it I would power it up and the=
 oscillators would be out of tune (when this doesn&#39;t occur they are alm=
ost perfectly tuned even without hitting the Tune button).<br><br></div>

<div dir=3D"ltr">
In that case when I hit the Tune button, it will cause a *mess* in the tuni=
ng rather than fixing the tuning -<br></div><div dir=3D"ltr">first few note=
s in the octave would be in the correct scale but the half top notes in all=
 octaves will play in a different scale !<br>


<br></div><div dir=3D"ltr">I also noted that in the same case the overall p=
itch would sometimes go up and done a few semitones.<br><br></div><div dir=
=3D"ltr">Again, most of the times it would power up, tune and play perfectl=
y. No need to get it warm or anything else...<br>


</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Is that an issue anyone e=
ver came across with ? Any suggestions except for checking the connectors ?=
<br><br></div><div dir=3D"ltr">Thanks !!<br></div></div>
</blockquote></div><br></div>

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