I'll get right on that.
Funny that you should ask, but when doing repairs, I've been in the habit
for years, of checking replacement caps before installing them.
That would include a value, internal leakage and dielectric absorption tests
in addition to testing ESR.

I regularly check new stock as I purchase it, and again before installing
electrolytic caps.

IMO, it's probably best to buy parts like electrolytics from a supplier that
buys direct and has a fairly fast inventory turnover, like DigiKey.

Buying electrolytics from surplus dealers can result in some very old stock.
It seems that old stock is liquidated to sellers/brokers that package them
individually for retail sale and offer them to small/independent parts
distributors, or just sell them in bulk to surplus sellers. Much of the
stock available from the
second or third transaction sources would no longer pass new specification
testing.
They may function in a hobby circuit, but their reliability is likely to be
very low.

There are often date codes on some of the better brands of electrolytics
(the usual thru-hole type with wrappers), so when old date codes on new
parts are encountered, it's time to get a different supplier.

--
Cheers,
WB
..............


"David Nebenzahl" wrote in message
.com...

So have you checked the ESR of the caps in the kit?