[Boatanchors] Electrolytic Reforming Time

[Dave Harmon]

+1

Dave Harmon
K6XYZ[at]sbcglobal[dot]net
Sperry, Ok.


-----Original Message-----
From: boatanchors-bounces at mailman.qth.net
[mailto:boatanchors-bounces at mailman.qth.net] On Behalf Of Geoff
Sent: Friday, December 30, 2011 8:20 PM
To: jfor at quikus.com; W8KZW
Cc: boatanchors at mailman.qth.net
Subject: Re: [Boatanchors] Electrolytic Reforming Time

Just replace all electrolytics as dried out electrolytes will not magically
repair themselves.
Reforming is pure folly as a complete failure will happen but you cant
predict it.

Carl
KM1H


----- Original Message -----
From: "J. Forster" <jfor at quikus.com>
To: "W8KZW" <w8kzw at arrl.net>
Cc: <boatanchors at mailman.qth.net>
Sent: Friday, December 30, 2011 5:36 PM
Subject: Re: [Boatanchors] Electrolytic Reforming Time


>I increase the voltage slowly monitoring the reforming current. You should
> keep the current low to (a) Limit local damage w/in the cap (b) prevent
> the whole cap from overheating, and (c) allow fluids to redistribute.
>
> For an old capacitor several days is not unreasonable.
>
> -John
>
> ===============
>
>
>> I just exchanged emails with a ham intending to spend up to two weeks
>> bring
>> a Heathkit Sixer up on a Variac.  Seems excessive to me.
>>
>> I generally bump the Variac 10 volts per hour, starting at about 60 volts
>> so
>> the rectifier generates B+.  Haven't had any issues that I can tell.
>>
>> When I put an old electrolytic on my Sprague TO-5 and bring it up to full
>> voltage, it only takes a few minutes for the current to drop to a
>> near-zero
>> level (on a good cap, anyway).  I figure that's when the can is reformed,
>> and anything beyond that is wasted - but I go an hour at each level on 
>> the
>> rig I'm bringing back just for some added margin.
>>
>> I'm certain opinions about this will range across the board, but I wonder
>> if
>> anyone has any feedback based on documented studies?
>>
>> 73,
>> Jeff
>> W8KZW
>>
>>
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>
>
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