[Boatanchors] Electrolytic Reforming Time

[J. Forster]

Not at all. Read my other post. No holes, no wires cut or anything w/in
the set.

-John

============



> Then it violates your code, its no longer original.
>
>
> ----- Original Message -----
> From: "J. Forster" <jfor at quikus.com>
> To: "Geoff" <geoffrey at jeremy.mv.com>
> Cc: <w9ran at oneradio.net>; <boatanchors at mailman.qth.net>
> Sent: Saturday, December 31, 2011 5:25 PM
> Subject: Re: [Boatanchors] Electrolytic Reforming Time
>
>
>> If you have the unit fused right, even if a cap does eventually fail, it
>> won't take the transformer with it.
>>
>> -John
>>
>> ===============
>>
>>
>>
>>> Id tend to flip those percentages to maybe 10-20% and thats with very
>>> high
>>> quality caps and some fairly late ones.
>>>
>>> It seems to me that we only hear from the same "reformers" over and
>>> over
>>> and
>>> the failed ones are very silent while licking their wounds and
>>> searching
>>> for
>>> new transformers or a rewinder.
>>>
>>> Just my $.02
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Robert Nickels" <ranickel at comcast.net>
>>> To: <boatanchors at mailman.qth.net>
>>> Sent: Saturday, December 31, 2011 4:32 PM
>>> Subject: Re: [Boatanchors] Electrolytic Reforming Time
>>>
>>>
>>>> On 12/30/2011 11:50 PM, Phil wrote:
>>>>> So, it doesn't pay to take any chances with those 'lytics.
>>>> I agree with all that's been said but would just add that this
>>>> business
>>>> of "bringing it up slowly on a variac" should be relegated to the
>>>> urban
>>>> legends file.  It's better than just applying full AC power, but is
>>>> still guesswork.   The only way to properly reform an electrolytic -
>>>> regardless of age - is to limit (and measure) the amount of current
>>>> being applied to attempt to "reform" the anode oxide layer that was
>>>> "formed" at the factory when the cap was manufactured.
>>>>
>>>> A good description of how the aluminum electrolytic capacitor works
>>>> can
>>>> be found here:
>>>> http://www.elna-america.com/tech_al_principles.php
>>>>
>>>> And here's a good reference for how to reform capacitors properly as
>>>> well as some alternatives:
>>>> http://www.nmr.mgh.harvard.edu/~reese/electrolytics/
>>>>
>>>> I prefer to measure and limit the current to about 5 ma while the
>>>> oxide
>>>> layer is reforming; trying to do the job by simply cranking up a
>>>> variac
>>>> every so often might work some of the time, but is like tuning your
>>>> rig
>>>> while blindfolded.
>>>>
>>>> I generally just replace electroyltics that are  cheap and readily
>>>> available and attempt to reform those that aren't.  I think most
>>>> "reformers" find the process can restore 80-90% of old caps when done
>>>> right, without fear of explosions or failure.
>>>>
>>>> 73, Bob W9RAN
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>>>
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>>
>>
>>
>>
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