[R-390] Help getting unstuck!

[Bob Camp]

Hi

Well a large pipe wrench attached to the appropriate  allen wrench, 
maybe combined with a five pound sledge probably would get i moving.

The obvious problem is that almost anything past normal pressure with a 
standard tuning tool is likely to shred the coil rather than moving the 
core. There is almost no reason to believe that moving the core is 
worth damaging the coil. Even if things are a bit out of alignment the 
radio probably will work perfectly well as it's set.

Often the problem is that the coil form has shrunk over the years and 
now it's simply to small for the core to move in. In that case it may 
need *more* not less humidity to be fixed. I have never had any success 
at "steam treating" in this situation but it's been recommended in the 
past.

Another idea is that you have crud in the threads. In order to get 
things moving you need lubrication. The punch line here is to use a 
light weight oil to free up the core. To me that sounds like an 
excellent way to destroy the core and or the coil. I would not try it 
on one of my radios. Another recommendation is to use spray on contact 
cleaner. I have tried that one and it didn't work on my coils.

I realize none of that is much help at all. The main point is that this 
may be one where simply leaving it as is makes the most sense.

	Take Care!

		Bob Camp
		KB8TQ



On Apr 1, 2005, at 1:35 PM, Craig C. Heaton wrote:

> Good Morning to All,
>
> Just finished putting a Motorola R-390A back together. Had to replace 
> many
> evil out-of-spec and leaky capacitors. The good news is no magic smoke
> escaped while plugging the receiver into a source of electrons. 
> Thought it
> might be a good idea to realign the receiver, it was receiving slightly
> before my attempts at restoration.
>
> Now the sticky question. Can't seem to get the top slug in T501 to 
> move. All
> of the other slugs will move. This transformer has a cover with a hole
> punched in the top center. Looks like a little rust between the slug 
> and
> coil form. I doubt I'm to first to tackle this sort of challenge. 
> Anyone
> been here before? What sort of fixes for a stuck tuning slug? Of 
> course, if
> it never moves again or I break it, does anyone have a spare?
>
> Seem to remember hearing in the Navy, "If its tight, its right". This 
> one is
> real tight, need to make it wrong.
>
> Tnx,
>     Craig
>
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