[time-nuts] Bad capacitors (was Volt-nuts cooperation?)

Dave Mallery dave.mallery at gmail.com
Sun Jun 21 22:12:35 UTC 2009


many thanks for the heads-up on the pg505 caps!

they are supposed to be 350 ufd at 75 vdc.  they are anything but.

(goes back to mixing/matching caps...)


On Sun, Jun 21, 2009 at 10:21 AM, Mark Sims <holrum at hotmail.com> wrote:

> The problems I saw were mostly hard failures in the caps
> (opens/shorts/etc).  These were in both power caps and signal caps.
> One lot that I saw was a group of 12 Mettler scales.  6 were used daily and
> 6 were never used backup units.  When the company shut down the operations
> that used the scales,  they were sold.  All the used units worked fine.  The
> backup units all had capacitor problems.
> I also bought a lot of new-in-box Tektronix TM500 modules.  Most wound up
> having flakey capacitors.  BTW,  EVERY (new or used)  Tek  PG505 pulse
> generator you will come across will have bad power supply filter caps...
>  unless they were replaced.
> ----------------------------------------
> Does this happen even if the electrolytics are reformed before use?
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Dave Mallery, K5EN                 (ubuntu linux 9.04)
HC31 Box 99E;                   Williamsburg,  NM  87942

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