[sdiy] "Zerolytics"

Ingo Debus igg.debus at gmail.com
Fri May 8 17:38:48 CEST 2020


> Am 05.05.2020 um 20:08 schrieb mskala at ansuz.sooke.bc.ca:
> 
> On Tue, 5 May 2020, Ingo Debus wrote:
>> Not necessarily. I once repleced a few electrolytics in a real old radio
>> (from the sixties or so). Some had become leaky but others had a much
>> higher capacitance than the value printed on them.
> 
> Unless you have measurements of where they were at in the sixties, I
> wouldn't conclude too much from this.  Electrolytic caps often have very
> wide tolerance ranges, like -20% +100%, so if the printed value is 10000uF
> and it now reads 12000uF, it could actually have started at 20000uF and
> lost 40% of its initial value; or it could have started at 12000uF and
> suffered no aging at all.

Ha, I still have some of those caps. The most extreme part has „500/3“ printed on it (I suppose that means 500 µF, 3 volts), and it measures about 1570 µF with an Agilent DMM.

Ingo



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