[R-390] Capacitors in R390 (non "A") vs those in R390A

[Cecil Acuff]

I agree with you Jack....after working on both the "A" is very notably a 
cost reduced version....a great radio but not built using the quality of 
components found in the R-390 for sure.

Cecil...
----- Original Message ----- 
From: "Jack Sullivan" <jsullivan10512000 at yahoo.com>
To: <R-390 at mailman.qth.net>
Sent: Friday, May 06, 2005 1:02 PM
Subject: [R-390] Capacitors in R390 (non "A") vs those in R390A


>I have noted the type/brand of condensors (we now call
> them capacitors) in R390 and in R390A, and I have been
> reading original data from manufacturers of those
> condensors, mostly from Spraque,that was in MA at the
> time.  Clearly, a huge difference in caps between
> original R390 and later cheapened up "A" version (I
> will probably hear nasty words from you "A" lovers,
> but "A" version was indeed cheapened up, for that was
> objective of the revamp).  However, some improvements
> were made in "A" version, as you probably already
> know.  Anyway, the caps used in the original R390 were
> about the best available at the time, many of them
> being Vitamin Q type, with insulation resistance of
> 200,000 to 300,000 megs.  Too bad that they didn't
> keep using those vastly superior caps in "A" version.
> Now, after 50 years, leakage is common with most paper
> caps, but the super caps in original R390 seem to
> still be doing well, based on my tests anyway.  Even
> the oil filled electrolytics in R390 are in great
> shape, if my set is any indication.  However, I did
> find the 50 mf, 50 volt small elect. one to be bad,
> but that is no problem to replace.  Nice to put new
> one in old case, so it all looks as it originally did.
> Hope this all doesn't sound like I know it all. I am
> just trying to share what I have been testing and
> reading, regarding caps in R390/R390A.
>
>
> <P>&nbsp;</P>
>
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