[R-390] Slug Rack Lube?

[Cecil Acuff]

Hi Barry and Group,

        I have been working on an R-390 recently that is also exhibiting the 
squeaking noise on a couple of the racks. I know it's not the coming from 
the cam/bearing contact points because they are well lubed and all rotating. 
(bearings) The ends of the slug racks and the RF deck frames are not 
touching or loose in my radio so It's not that...so it only leaves the cores 
sliding in the coils.  The R-390 has no adjustment that allows tensions to 
be removed from the cores due to slight misalignments as the "A" does.  I 
noticed the cores are also coated with some type of shiny outer coating as 
well.  Maybe to aid in friction reduction.

I have heard of guys using a ceramic stone and polishing those contact 
points.  I would assume some type of lubrication would also be in order.  I 
have used the Mobil 1 synthetic lube at those points as well with good luck.

A good Teflon gun lube would also be another thought...

Cecil...


----- Original Message ----- 
From: "Barry" <N4BUQ at aol.com>
To: "R-390" <R-390 at mailman.qth.net>
Sent: Friday, May 13, 2005 10:04 PM
Subject: [R-390] Slug Rack Lube?


> What are some of you guys using to lubricate the slug racks?  I have a 
> very
> squeaky 0.5 - 1.0 rack.  It is not the cam followers, but the rack sides
> against the frame.  I had thought about some kind of silicone coating
> (spray?) but didn't know.  It seems MobilOne is too thin in this area, but
> maybe not.
>
> Thoughts?
>
> Thanks,
>
> Barry - N4BUQ
>
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