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

[Dallas Lankford]

----- Original Message ----- 
From: "Dallas Lankford" <dallas at bayou.com>
To: "Bob Camp" <ham at cq.nu>
Sent: Monday, January 10, 2005 7:46 PM
Subject: Re: [R-390] Servicing Advice on Signal Generator URM-25D


> Every one I have ever checked from an R-390A was good.  Every black one I
> ever saw from an SP-600 was bad.  But if you want to replace R-390A
> capacitors anyway, I am sure you will.
> 
> Dallas Lankford
> 
> 
> ----- Original Message -----
> From: "Bob Camp" <ham at cq.nu>
> To: "R-390 HF Receiver List" <r-390 at mailman.qth.net>
> Sent: Monday, January 10, 2005 7:43 PM
> Subject: Re: [R-390] Servicing Advice on Signal Generator URM-25D
> 
> 
> > 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
> >
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