Yamaha CS80

Dave, 

I appreciate the information and this is not a challenge, just an attempt to
follow up.

The fact that the tantalum was intended for DC bypass, appears not to
require a polarized cap? Again, it was my expectation that a polar cap would
be preferable in this application?

And of course all caps can eventually leak, and modern electrolytics appear
to have a better reputation for longevity and size to capacitance rations
than they did 25 years ago.

And as to sizing and precision of the capacitance spec, again I would think
the more capacitance the better in this application?

And comments and information is appreciated.

-----Original Message-----
From: yamahacs80@yahoogroups.com [mailto:yamahacs80@yahoogroups.com] On
Behalf Of David Rogoff
Sent: Sunday, February 20, 2011 11:48 AM
To: yamahacs80@yahoogroups.com
Subject: Re: [yamahacs80] RE: Re: My own CS-80

>
> 	
>
>
> ------------------------------------------------------------------------
>
> 	Leslie Schwartz <mailto:lhs_emf@...>
> February 20, 2011 8:55 AM
>
>
>
> I agree that the recommendation is puzzling to me too. I would have 
> expected
> that new polarized electrolytics would have been the type to use for a
> replacement of the tantalums.
>
> Good video though, and some more good info on CS-80 maintenance/repairs.
> Thanks.
>
> -----Original Message-----
> From: yamahacs80@yahoogroups.com [mailto:yamahacs80@yahoogroups.com] On
> Behalf Of Quazimodo
> Sent: Sunday, February 20, 2011 10:31 AM
> To: yamahacs80@yahoogroups.com
> Subject: [yamahacs80] Re: My own CS-80
>
> I think the YouTube series of videos on saving the CS80 - by Gavin 
> Curtis -
> shows those tantalum capacitors replaced with non-polarised polystyrene
> caps.... can that be right, replacing polarized with non-polarized?
> ------------------------------------------------------------------------
I haven't seen the videos, but a couple of general capacitor notes.  
First, pretty much no one has used tantalums in many years now.  They 
were a way to get a high value in a very small package.  However, they 
turned out to be really flaky, especially if ever connected backwards.  
There are much better replacements now.  Also, there's nothing wrong 
with using a non-polarized cap to replace a polarized one.  Again, 
polarized (e.g. tantalums - which can blow up, electrolytics - which dry 
out and fail over the years) caps were a way to get a higher value in a 
smaller package if you knew the voltage only would go one way - like in 
a power supply.

I'll have to look into the polystyrene caps more, but if they have the 
same capacitance value, voltage rating, and they're small enough 
physically, they're probably a much better choice.  They shouldn't dry 
out like electrolytics. Non-polarized means you don't have to worry 
about putting it in backwards.  And, I'm sure they better in other ways 
- better tolerance, lower ESR, etc that could make them perform better 
in some applications.

  David


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