[Techtoolslist] 100uF 20V Wet Tantalum Substitute?

[Bill Karkula]

CRC has graciously offered one to me for the postage and I have emailed him
back with my mailing address and a big thank you.  

I was really impressed - The outside was dusty but the inside was immaculate
like the day it left the factory.  It's big and heavy but will fit on my
scope cart.  A quick check and other than the timebase range problem due to
that cap, the accuracy was almost factory perfect as well with strong sync.
It also has the multimeter option on the cover - an added plus.  It looks
like all it needs is a good external cleaning and this cap replaced and I am
good to go.  I'm not worried about leakage - if the replacement lasts half
as long as the original one did, I'll be in great shape.

Bill

-----Original Message-----
From: techtoolslist-bounces at flippers.com
[mailto:techtoolslist-bounces at flippers.com] On Behalf Of Rodger Boots
Sent: Monday, April 27, 2009 6:19 PM
To: Technical Tools Mail List
Subject: Re: [Techtoolslist] 100uF 20V Wet Tantalum Substitute?

There should be no problem using a regular tantalum there.

One little known factoid about HP test equipment is that it is mostly 
designed to military specifications.  As the story goes, if the military 
orders a military version of a piece of test equipment about the only 
thing that changes is the paint color.  So they may have used the wet 
tantalum for that reason, or maybe it was the more common part back when 
this was made.

Wet tantalums aren't used as much these days, if for no other reason 
than the "wet" part that leaks can cause a lot of damage.

Bill Karkula wrote:

> I acquired an HP1740A scope and all is well except this one capacitor

> described as 100uF 20V +/- 10% wet tantalum which has leaked and the

> electrolyte crystallized located on the timebase board.  Do I need to

> replace it exactly or is there a newer type of capacitor that can be used

as

> a substitute with better than or equal to characteristics of a wet

tantalum?

> I looked around and the wet tantalums are very pricey.  I know capacitor

> technology has come a long way and maybe someone can help save me the

> research.

>

>  

>

> Thank You,

>

>  

>

> Bill

>

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