"John Larkin" wrote in message
...
On Wed, 30 Sep 2015 19:42:56 +0100, "Ian Field"
wrote:


"bitrex" wrote in message
.. .
So I'm working on repairing a Korg MS2000B synthesizer for a friend with
a
dead power supply. Here's the service manual:

http://www.loscha.com/scans/Korg_MS2...ice_Manual.pdf

The first thing I notice when looking inside is that the small SMT 100uF
10V tantalum capacitor C109 has completely vacated - it appears to be
gone, blown right off the board. There are some little fragments
rattling
around in the case.

I have little experience with tantalum capacitors. Any suggestions for
a
more reliable replacement?


You can get MLCC capacitors as big as 180uF - but it won't fit in the
original space.

They're mostly advertised as SMD, but that certainly won't fit - a few
suppliers offer resin dipped leaded versions that you could form the leads
to meet the pads.

Aluminium electrolytics of any kind are a no no! - there was much chatter
about organic semiconductor electrolytics a decade or so ago, that were
claimed to be as good as tantalum, but it lately seems to have gone very
quiet on that front.

The polymer aluminums are really good. Low leakage, low ESR, don't dry
out.

Saw an article about those a while ago - did they ever take off?

The organic semiconductor variety were supposed to be the "dog's nuts" - but
all the hoo ha seemed to mysteriously fade away.