[R-390] How to free stuck IF slugs?

[Craig C. Heaton]

Good Morning Jim,

Sounds as if the slug is already cracked. Try using a small pick, etc. and
clean the top of the slug. You might now be able to see or feel crack/cracks
in the slug. If this is the case; time to shop for a new/used IF
transformer.

Others have been lucky and used a alignment tool with a dab of super glue
and the slug has moved/peaked after the glue dried and pulled the slug away
from the ID of the coil.

I had this same issue on T101, don't have the manual in front of me, could
be another transformer. Anyway, someone on the forum listed a transformer
and some RF slugs for sale a couple months after finding the cracked slug.
Just what dad needed!

Another option if a spare transformer is available/found; a root canal. Use
progressively larger drill bits drilling out the stuck slug and replacing it
with a slug from the other transformer.

Good luck, it can be fixed.

Regards,
Craig

-----Original Message-----
From: r-390-bounces at mailman.qth.net
[mailto:r-390-bounces at mailman.qth.net]On Behalf Of James Cottle
Sent: Saturday, October 08, 2005 9:54 PM
To: R-390 at mailman.qth.net
Subject: [R-390] How to free stuck IF slugs?


OK, so I finally got around to doing an IF alignment on my R-390A. On
the first fixed IF transformer, the primary slug (bottom) moves so that
I can peak the diode load at 455Khz. The top slug, however, is stuck to
where an unsafe amount of torque will still not allow me to turn it in
the coil form. What does one do to free these ferrite slugs in the coil
form? I know that turning it with force is definitely NOT the answer,
for that has been known to crack the coil form. I am left with the
question: Does anyone have a tip in how to free these slugs? I know they
are normally tight, but should not be immovable. I had the same problem
with the single slug form T208. All I want to do is peak T203 and T208 I
think these are the numbers...not messing with the staggered IF
transformers) Any help would be appreciated.

Thanks in advance

Jim
AC4EA
San Francisco
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