[R-390] Filter cap temperature

[Barry]

I did "caps in an octal socket" for my Motorola.  It works nicely, but I
don't really see that much advantage to having them "plug-n-play".  I'm
thinking of doing what I saw someone else do.  Using axial-lead caps, run
the positive lead through the appropriate hole in the socket and solder
underneath.  Gather the negative leads together, solder them to a ground lug
and attach the ground lug to the standoff where the original cap clamp
attached.  I thought that was a pretty neat solution.  Digging out
ukkumpucky gets old.

Barry - N4BUQ



> I think a rebuild is a standard thing with the "A".  I have several in the
> shop and everyone I have checked had excessive leakage.
>
> I would do the rebuild.  There are several ways to go...caps under the
> chassis, caps in octal socketed square relay housings or the traditional
cap
> overhaul where you cut the things open and replace the guts.  I am about
> half way through that process with a pair of mine but have had to put it
on
> the back burner for a few weeks while I finish another project up!
>
> Cecil...
> ----- Original Message ----- 
> From: "Barry" <n4buq at aol.com>
> To: "R-390 HF Receiver List" <r-390 at mailman.qth.net>
> Sent: Friday, May 06, 2005 8:36 AM
> Subject: [R-390] Filter cap temperature
>
>
> > While tinkering with the "new" R390A last night, I noticed that C603 is
> > getting slightly warm.  The other cap is cold.  Is this possible an
> > indication of low ESR?  Do these old caps generally leak a bit or should
I
> > be concerned?  I hadn't planned on replacing them as they seem to be
> > working, but if they're going to blow, then I'd rather go ahead and
> > replace/rebuild them.
> >
> > Thanks,
> >
> > Barry - N4BUQ