Generally, old electrolytic caps that have just been allowed to sit can be
re-formed and henceforth operate properly. This allows the vintage component
to remain in the vintage set. [Second-last resort is to hide a new type
inside the old case. Last resort is to 'destroy' the vintage item by a
butchery replacement. [Always keep all the old components for the next
owner].
There are military re-former equipments. One has a table of capacitance vs
allowed leakage current vs voltage. Google for more info - but beware the
Audiophools.
John Kaesehagen.
[PS. Reforming is just the [slow] application of a [preferably guarded]
voltage to the capacitor - exactly as was done during manufacture. ]
----- Original Message -----
From: Adam Jacobs
That was the first thing I noticed, too. Those are the old paper & oil
electrolytic caps, I think. In tube radios it is common practice to replace
those as fast as possible. ...clip....
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