[ARC5] Powering an ARC-5 Receiver After Long Storage

[J. Forster]

> If whomever is doing this hopes to "reform" the bad capacitors, I am sorry
> to have to tell you, that will not work.
>
> First of all, "reforming" only works with electrolytic capacitors. The bad
> capacitors in our favorite receivers are, except for 2 or 3, NOT
> electrolytics.

Yes, and yes. I know that.

> Secondly, the reason they fail is that they are filled with beeswax, which
> is very slightly corrosive, and the cans are brass.

The point of asking about the nominal current is precisely to detect such
leakage.

> After 70 years, the beeswax reacts with the brass to form verdigris, that
> green crap, which, essentially, shorts the capacitors out.
>
> The only solutions are replacement or restuffing.
>
> In my experience, the few electrolytic caps in the receivers are not
> always bad, and when they are, nothing much bad happens.

If a bad electrolytic shorts out a cathode resistor, the tube bias is
altered, possibly blowing an output transformer. This happens in other
sets.

-John

==================
>
> Ken W7EKB
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