[Premium-Rx] Prevent Broken Slugs

[R at 14971]

1967 - the slugs are likely to be fixed with wax or paint (some places 
even used nail varnish).

If wax - heat gently with a hair dryer. Focus the heat with some alloy 
cooking foil (like a heat shield). Heat a little - but often - the wax 
doesn't have to be hot at all - just warm to the touch. Other components 
will not be affected.

If paint - applying any thinners will attack the insulation on the 
windings, or the bobbins. Similarly, applying a lubricant will ruin the 
ability to lock the core again.

Sadly - cores can crack with just a small amount of force if the correct 
fitting tool isn't used.

By the way - core lockng was as much to guard against the slug 
'creeping' due to temperature cycling as it was against vibration. So 
re-locking a slug is important.

Richard


On 26/08/2017 01:15, Gary Geissinger wrote:
> Gentlemen,
>
> I have a receiver that was manufactured in 1967 that has never been aligned since it left the factory.  Unfortunately it needs to be aligned.
>
> While I have the correct plastic and nylon Hex alignment tools for the slugs in the variable inductors and transformers, I worry that the slugs might not move or will bind up.  I really don't want to crack a slug.
>
> Are there any good ways to prevent cracking a slug that has never been adjusted? They only need slight adjustment and none appear to be at end of travel.
>
> It seems like a few drops of isopropanol or a little heat might help.  But I also see the downside to both ideas.  I know from experience that slugs that are thermally cold are more likely to not move and crack.
>
> I would love some good ideas right about now.  I will adjust the variable capacitors first hoping that prevents the need to adjust the RF inductors, but the IF transformers adjust only with slugs.
>
> Thank You,
>
> Gary WA0SPM
>
>
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