[ARC5] Aging Electrolytics

[David C. Hallam]

I had to replace the HV cap in my HP606B.  The output signal was 
unstable which I traced to ripple to excessively high in the B+ ripple 
voltage.  Finding a replacement was a PITA.  First just finding on that 
would fit in the space of the one was hard.  Second, HP floated this 2 
or 3 section( I don't remember which) capacitor above ground so it had 
to be insulated.  Yes, I could have used several modern capacitors in 
its place, but I didn't want to.  I finally found a new manufacture can 
at AES, but was a little larger in diameter than the old one.  I had to 
do a little metal work to make it fit, and then insulate the can.  I am 
glad it caught it before it failed.

David
KW4DH

On 2/1/2015 9:04 AM, Bruce Long via ARC5 wrote:
> Well Leslie:Perhaps your HP608 was re-capped with reformed new old stock capacitors?bruce
>
>        From: Leslie Smith <vk2bcu at operamail.com>
>   To: ARC-5 List <arc5 at mailman.qth.net>
>   Sent: Sunday, February 1, 2015 12:54 AM
>   Subject: Re: [ARC5] Aging Electrolytics
>     
>    Hello Glen,
>    I saw my HP 608 signal generator 'go up in smoke' because I trusted
>    the advice I got when I bought the unit.
>    In brief - I was told - "recapped"
>    One HV cap 'went' and then everything back from it 'went',  including
>    some hard to get RF chokes.
>
>    YOUR ADVICE IS LIKE GOLD.
>
>    73 de Les Smith
>    vk2bcu at operamail.com
>
>
> On Sun, Feb 1, 2015, at 15:14, Kenneth G. Gordon wrote:
>> On 31 Jan 2015 at 16:55, Glen Zook via ARC5 wrote:
>>
>>> Frankly, in the long run, just replacing older electrolytics and paper
>>> capacitors automatically, generally saves a lot of money in potential damage to
>>> other components as well as time spent in trouble-shooting when that component
>>> completely goes bad. It is usually a case of pay a little bit now or pay a LOT a
>>> little bit later! Glen, K9STH
>> I am COMPLETELY on your side on this one...
>>
>> Ken W7EKB
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-- 
There are two possible outcomes: if the result confirms the hypothesis, then you've made a measurement.
If the result is contrary to the hypothesis, then you've made a discovery.
Enrico Fermi



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