Hi Perry:
(shameless plug) Have you measured the tantalum caps?
I sell a combined ESR & Capacity meter that does in circuit tests on powered
down circuits.
http://www.prc68.com/P/Prod.html#ESR
For an example of it's use on a Heathkit GC-1000 WWV clock see:
http://www.prc68.com/I/HeathkitGC1000.shtml#Rx and scroll down for more boards.
Notice that sometimes the ESR is high and other times the capacitance is low
for the bad caps.
The tantalum caps were OK, but almost all the electrolytic caps were bad.
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Perry Sandeen via time-nuts wrote:
List,
OK everybody, let’s not get our pacemakers wound up<G>
The problem. (Long Intro)
I have about 15 pieces or so of older HP test equipment.
3586B, 5370B, 5335A to name a few. Because of their age of 20+ years a few
have failed and need repair. I
have decided to go on a wholesale electrolytic capacitor replacement on all of
them. (Mouser will be able to declare an extra dividend)
For all the *standard* types I’ve chosen mostly Panasonic
105C 10,000 hour caps. So far, so good.
Now I come to the issue of the wet-slug tantalums that were
used. At the time of manufacture, these
were the best and most expensive low voltage electrolytics available.
The question is: can one replace the tantalums with the high
grade (105C) Panasonic or Nichicon capacitors with an equal or higher
capacitance value?
Even using the *tear drop* new replacements one is looking
at very heavy $$$.
Regards,
Perrier
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