[R-390] Servicing Advice on Signal Generator URM-25D

[Bob Camp]

Hi

I asked this back a few years ago and maybe it's time to ask it again.

Has anybody seen any of the black or brown body / epoxy coated paper 
and foil capacitors made in the 1950's and 1960's show up good?

As originally asked the question was specific to the R-390. Since then 
I have seen a bunch of posts on a number of reflectors about these 
parts. They all seem to indicate these parts are a problem.

At least in my experience, testing pulls from a couple dozen radios 
they show up leaky (as in 5X out of their original specification) 
roughly 80% of the time. They show up at least 2X the specification 
 >90% of the time. Certainly there are places where you will not notice 
leakage even if it is 5X the specification. Most of these seem to get 
used in high impedance circuits where you will notice the effect 
though.

	Take Care!

		Bob Camp
		KB8TQ