[sdiy] Tantalums in Yamaha CS20M/CS40M

[Jerry Gray-Eskue]

<<I would replace a tant. with a tant. on the main voice circuits but not in
the power supply, if they are really exchangable (are they?)>>

I would tend to agree with this recommendation. The big difference is the
tantalum has a significantly higher ESR AND I think much tighter tolerances.
If you go swapping them on a voice board you may change the sound. The
circuit may have required a specific capacitance and may be designed on the
additional resistance of the cap ( ESR ) in filter or similar device the
capacitance and resistance defines the frequency response and etc.

In analog Power supplies there is no "Magic" to the caps, and if they happen
to be +50% it usually just means less ripple, take a look at the circuit
though to be sure the ESR is not some esoteric part of the voltage
regulation...



-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Gil W.
Sent: Wednesday, June 10, 2009 5:09 PM
To: dixon at interchange.ubc.ca; synth-diy at dropmix.xs4all.nl; Pete
Swarbrick
Subject: Re: [sdiy] Tantalums in Yamaha CS20M/CS40M



I would replace a tant. with a tant. on the main voice circuits but not in
the power supply, if they are really exchangable (are they?)

I won't bear a short circuit in a power supply caused by a failing tant,
although I still have them crossing the main voltage rails in my refurbished
Prophet 5.... Guess I'll just have to keep recap my synths every 15 years or
so ;)



--- On Thu, 6/11/09, Pete Swarbrick <peter.swarbrick at panavision.co.uk>
wrote:

> From: Pete Swarbrick <peter.swarbrick at panavision.co.uk>
> Subject: Re: [sdiy] Tantalums in Yamaha CS20M/CS40M
> To: dixon at interchange.ubc.ca, gil_we at yahoo.com,
synth-diy at dropmix.xs4all.nl
> Date: Thursday, June 11, 2009, 12:53 AM
>
>
>
>
>
>
> Re: [sdiy] Tantalums in Yamaha CS20M/CS40M
>
>
>
>
> Yes, they do ! Spectacularly and
> destructively on occaision
>
>
>
> ----- Original Message -----
>
> From: synth-diy-bounces at dropmix.xs4all.nl
> <synth-diy-bounces at dropmix.xs4all.nl>
>
> To: 'Gil W.' <gil_we at yahoo.com>;
> synth-diy at dropmix.xs4all.nl
> <synth-diy at dropmix.xs4all.nl>
>
> Sent: Wed Jun 10 22:06:49 2009
>
> Subject: RE: [sdiy] Tantalums in Yamaha CS20M/CS40M
>
>
>
> Why would they blow up if they were installed in the right
> direction?  Do
>
> old tantalums (tantala?) simply blow up on a whim?
>
>
>
> > -----Original Message-----
>
> > From: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-
>
> > bounces at dropmix.xs4all.nl] On Behalf Of Gil W.
>
> > Sent: Wednesday, June 10, 2009 11:52 AM
>
> > To: synth-diy at dropmix.xs4all.nl
>
> > Subject: [sdiy] Tantalums in Yamaha CS20M/CS40M
>
> >
>
> >
>
> > I open up my monstrous CS20M (and my friend's
> CS40M), and I see a lot of
>
> > tantalums in there. Before one blows up and shorts the
> thing, do you think
>
> > it will be safe or wise to replace them all with a
> similar valued
>
> > electrolyte ? Will the sound get worse a bit ?
>
> >
>
> > Particularly the power supply... There are four
> 1uf/35v tants in there,
>
> > can I just drop 1uf electrolytes instead of them ?
>
> >
>
> > Thanks ;)
>
> >
>
> >
>
> >
>
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