[time-nuts] Electrolytic Capacitor Question
jgray at zianet.com
Mon Nov 10 21:51:31 EST 2014
I bought one of those ESR testers some time ago. It works very well. It is
from Russia, but ordering from Brooke is much easier :-)
On Mon, Nov 10, 2014 at 6:51 PM, Brooke Clarke <brooke at pacific.net> wrote:
> 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.
> 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
> 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
> Perry Sandeen via time-nuts wrote:
>> 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 $$$.
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