[sdiy] electrolytic cap degradation over time ?

[dave]

I have recently had trouble with my meridian power amps. It turned out that
apart from a faulty bridge the capacitors in the power supply were causing a
problem. They can dry out over time (my amps are about 15 years old) . I
replaced the caps and now they run fine. I also discovered that there are
such things as capacitors rated specificaly for use in audio.

this dosent answer any of your questions , just my experience on the matter.
dave
----- Original Message -----
From: "Peter Blackett" <dragon.servicing at virgin.net>
To: "synth Diy list" <synth-diy at dropmix.xs4all.nl>
Sent: Sunday, February 29, 2004 6:27 PM
Subject: [sdiy] electrolytic cap degradation over time ?


> Hi,
> a question for those knowledgeable people on this list .
> I've been looking at an Arcam cd player about ten years old .
> the problems with it are that one output channel is low in volume and
> lacks bass .
> so I opened up the case and found after looking at the circuitry that
> one of the  electrolytic caps in one output channel has lost value .
> ( it measures about 10% of what it should do ).
> I know that its a problem with degradation over time , but are there any
> pointers that I should look at for replacement caps ?
> are 105degree rated caps likely to last longer than the 85 degreee rated
> caps ?
> I'm assuming this is why a lot of caps are needing changing in synths
> and their power supplies .
> regards Peter
>