FW: [sdiy] Tantalums in Yamaha CS20M/CS40M

[Samppa Tolvanen]

On Thu, Jun 11, 2009 at 2:03 AM, Jerry Gray-Eskue<jerryge at cableone.net> wrote:

> As you can see the were expected to last a very long time and be extreamly
> stable.. However some of the old gear has been around for a very long time,
> I wonder if the bad reputation these have with some of post has to do with
> caps that are at EOL, or perhaps new but abused. With high ESR it is very
> easy to prematurely kill a cap due to ripple current and heat build up. It
> is obvious that they would fail in applications that an electrolytic cap
> would be fine with. This may be viewed as a defect buy some people who have
> tried using them.
>

Excessive ripple currents can also be seen as a design error. But when
You bring up EOL to the discussion, You should also consider the
failure mode.

Regularly used wet-electrolytics gear doesn't "DIE", it starts to hum:
"Time to re-cap"

versus

Regularly used Tantalum gear "DIES" as in "It was perfect Yesterday"
and with any "Good Luck" (TM) it's one of those 10s of the buggers,
that is short enough to bring the rail down, but still refuses to
blow.

Even electronic musical instruments should be considered as musical
instruments. Fine musical instruments gain value as they age. On the
forked thread somebody mentions PC motherboards - with the current
trend of Consumerism, these "need" to be replaced every 3 years or so,
any longevity would be a costly design error there. Too bad some MoBo
manufacturers went to that "Too good to be true" deal and bought
mainland China -fake caps as Japanise. Those simply aren't "Rubycons"
and You might be fooled to think that Wet-electrolytics Blow, when
they don't Suck.

Samppa