[R-390] Newb question, slugs

[Larry H]

Hi Jason,  Welcome to the list and congratulations on the R-390A.
The slugs are connected to the adjusting screw with a flexible coil tightly wound heavy wire.  It should only flex a little bit or it will bend and not easy to straighten up.  If it is bending at all, it is probably binding in the coil form.  Be very careful trying to clean the inside of the form - water and oil will damage it.  See doc online on this subject.  To see if it binding, remove the 2 small screw holding the adjustment plate on the rack and try to move it up and down by hand.  Source of sticking can be 1. foreign material in the form, 2. overheated coil form, 3. who knows.  If it's sticking (which is not uncommon) try to remove the slug manually then the rack and then the can so you can see inside it to get a better idea of the problem.
Good luck and let us know how you progress.  
Regards, Larry_________________________________________________________________________________________

 From: Jason W6IEE <w6iee.73 at gmail.com>
 To: r-390 at mailman.qth.net 
 Sent: Sunday, February 7, 2016 9:01 PM
 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

-- 
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