[R-390] Newb question, slugs

[Craig]

Jason,

I see you already have several suggestions as how to approach the slug
issue. Best to remove the two springs that hold the rack. This will let you
lift the entire strip containing all three slugs.

Then unscrew the sticking slug from the rack. Using only your hand, insert
that slug into the coil. Is it free to move up and down? If not, first try a
dry q-tip to remove dirt/etc. Any better yet? 

If not, don't use oils or anything wet. Trust me, the slug has not swelled
and increased in diameter! For whatever reason the paper form inside the
coil assembly has swelled and the inside diameter is less.

Going by memory here:

#1: Measure the OD of the slug. You will find it to be the same OD as a
common drill bit. 
#2: Purchase a new or "unused" drill bit of the same OD.

NO! Do not use the cutting end and drill the inside of the form! There must
be "no" nicks or damage to the end which fits into the chuck!

#3: Use the end of the drill bit that fits inside the drill motor chuck. The
bit should have a slight tapper on that end. Now slowly push it (by hand)
into the coil form with a slight twist. Work it slowly into the entire
length of the form. 

What you are trying to accomplish is to iron the paper back into its
original shape. 

The above method has worked for me. YMMV

Good Luck with the new RX,
Craig

-----Original Message-----
From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Jason W6IEE
Sent: Sunday, February 07, 2016 9:02 PM
To: r-390 at mailman.qth.net
Subject: [R-390] Newb question, slugs

Hi,

I have recently acquired a bit of a beater (yet operational) R390A, and have
so far replaced C553, C559, and that leaky cap in the AF section.
About to re-stuff the filter caps.

My receiver was stored in a rather "porous" shed in the desert, probably
wrapped with (some) plastic for umpteen years. It's just a little dusty, and
a lot better than expected under the circumstances.

Understandably, the grease in the gears has hardened into nothing, and there
was a definite metal on metal sound and feel. This evening I started
applying what I call "Groil" ( somewhat equal parts red light weight wheel
bearing grease, non-detergent 30 weight, and Marvel Mystery Oil.) to the
gears and cams, and have seemed to have everything smoothed up considerably.
(with much application still yet to do.)


However, I noticed that one of the slugs in the back is... in my best
attempt to describe this, Offset from its adjusting screw. And flexing, when
that slug rack moves. (I can shoot a little video of this, if that would
help.)

 Is there a section of "piano wire" in between the slug and it's adjusting
screw? Are they really supposed to deflect? Or is this thing just threaded
brass, which is fatigued and about to snap?

Thanks,
Jason W6IEE

--
w6iee.blogspot.com
ColorBurst Liberation Army, #4
http://en.wikipedia.org/wiki/Junk_box
http://www.flickr.com/photos/kf6pqt/
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