[time-nuts] Need - PRS10 magic smoke

[paul swed]

Bob,
I would guess the tantalum was up to the job. But only for the first 7
years of its life. We tend to keep using things way past the intended life.
Maybe a case of just replacing the cap and cleaning up the stuff it sprayed
out when they burn like that. I have fixed a lot of test equipment that is
now on my bench thanks to those caps.
Kind of a love hate affair.
Regards
Paul.
WB8TSL

On Mon, Jun 13, 2016 at 8:13 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> In a run-away oven situation, the solder generally looks a lot worse and
> the board is a lot closer to black than
> chocolate brown.  Best guess - that magic tantalum isn’t up to the job
> they are trying to make it do.
>
> Bob
>
> > On Jun 13, 2016, at 6:32 PM, Skip Withrow <skip.withrow at gmail.com>
> wrote:
> >
> > Hello time-nuts,
> >
> > Well, broke out a PRS10 that I had put away for a project some time ago
> and
> > upon power up found that it had issues.  Status indicated low lamp output
> > and high lamp temperature.  Duh!  Upon removal of the lamp assembly it
> > became abundantly clear that the magic smoke had gotten out.
> >
> > If I recall correctly, seems like there was another PRS10 with corrosion
> > issues in the same area.  My guess is that the heat does not help this
> > situation.  I suspect that I may have a full-on heater, which may have
> > caused the tantalum cap (and possibly other) failures.
> >
> > Looks like this may be the weak spot in these oscillators.  I'm very
> > hopeful that a rebuild will bring it back to life.
> >
> > Thought you would enjoy the pictures though.  Two are attached.
> >
> > Regards,
> > Skip Withrow
> >
> > <
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