I have put an old Allen wrench into a stuck slug and heated it
with a
large soldering iron, then carefully remove the slug by turning the
Allen wrench with a pair of pliers while the slug was warm enough to
melt the wax.


That's a good way of transferring the heat. But care must be taken
not to tork the allen wrench too much. I've broken far too many slugs
with those inflexible steel tools.


One other thing, some coils are sealed with "Printer's Ink", a
water
based ink that chips easily. We used it on all the coils in the
PRC-77 radios built by CE.

Thanks for that reminder. Forgot about some water soluble sealers.


You have to be careful drilling holes in circuit boards. I have
worked on a lot of RF boards with traces run under coils that will be
destroyed with a drill bit.

That's a given, that care must be taken where you drill. I've never
damaged a trace yet, though I've opted not to drill some. Of course if
the board has internal traces (sandwich) forget it!!


Ed

"Ed G." wrote:

I have put an old Allen wrench into a stuck slug and heated it
with a
large soldering iron, then carefully remove the slug by turning the
Allen wrench with a pair of pliers while the slug was warm enough to
melt the wax.


That's a good way of transferring the heat. But care must be taken
not to tork the allen wrench too much. I've broken far too many slugs
with those inflexible steel tools.

One other thing, some coils are sealed with "Printer's Ink", a
water
based ink that chips easily. We used it on all the coils in the
PRC-77 radios built by CE.

Thanks for that reminder. Forgot about some water soluble sealers.


You have to be careful drilling holes in circuit boards. I have
worked on a lot of RF boards with traces run under coils that will be
destroyed with a drill bit.

That's a given, that care must be taken where you drill. I've never
damaged a trace yet, though I've opted not to drill some. Of course if
the board has internal traces (sandwich) forget it!!

Ed

The last boards I worked on were 16 layer. About the only place you
could drill was through a bad via the connected the top and bottom
layers. At up to $8000 per board, they were rather fussy about extra
holes in new boards.
--


Michael A. Terrell
Central Florida

that was semi-official repair policy for apple II computers in the
minnesota education system... turn it off, lift it up a foot or two, and
flat-foot slam it back on the table. oxidation and heat popping on the
tin-socketed chips, you understand, and the machine was well enough
built so you could get away with it.

Jim Hampton wrote:

Dean,

This is one reason we have problems attracting newcomers. The incessant
flames. The fact is once you mention "tubes", folks should realize that the
thing may indeed not be well tuned. I'm trying to think if it is the GE
Master II ... but it is a VHF rig and the cavities used to grow "crystals"
in 'em and detune 'em. One guy showed me a quick way to fix it (yes, you
can go in with a q-tip). He picked the radio up and banged it on the bench
about 3 or 4 times. Suddenly, it no longer took 4 uV to get a decent
signal. It was down to 0.25 uV. I did have to clean my shorts out the
first time I saw it, however :)

I was given an old SP-600 which had been under salt water for a brief period
of time (I got the radio in 1968). I ended up replacing most of the
components in the whole front end as it could barely receive local broadcast
stations. It worked fine after I did that, but it was a real mess. Easier
to buy a new receiver these days (prices are reasonable and if you figure my
time, I was probably making about twenty five cents per hour fixing that
slug!). Of course, that was back in the late 60s. Figure a grand buck and
a half an hour in today's wages :) It was a good learning experience,
however.

73 from Rochester, NY
Jim

"

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Checked by AVG anti-virus system (http://www.grisoft.com).
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-- If it's a "new economy," why do they want my obsolete old money?

K5DH wrote:

I am restoring an old Kris 23+ tube-type CB radio.
As with most Japanese-made CB gear from that era,
the coil slugs are held in place with some sort of
glossy white paint-like sealer. How do I dissolve
that sealer without damaging the coil forms? I'm
unable to budge the slugs with a diddle stick, and
I don't want to risk fracturing a slug by trying
to force them.

73,
Dean K5DH


I've always had good luck by heating the slug with a soldering iron tip,
set on low heat. The "gliptall" will usually melt before the coil form
does, but be careful just the same.

Dave
"Sandbagger"

Scott Schrader wrote in news:3F4E39DD.A59629F7
@visi.com:

try alcohol first for solvent, it should not mangle coil forms. if that
doesn't work, a paintbrush with a little bit of acetone is the next step
for solvent.


What I did for those stubborn slugs was to heat them with the tip of my
weller. The heat will soften the paint/sealant and not damage the coil
form.

r

Irv Finkleman wrote:

K5DH wrote:

I am restoring an old Kris 23+ tube-type CB radio.
As with most Japanese-made CB gear from that era,
the coil slugs are held in place with some sort of
glossy white paint-like sealer. How do I dissolve
that sealer without damaging the coil forms? I'm
unable to budge the slugs with a diddle stick, and
I don't want to risk fracturing a slug by trying
to force them.

73,
Dean K5DH

Usually a drop of solvent will loosen them. If the coil
forms are plastic it might be a problem, but you can test the
solvent on the end of the form first.
--
--------------------------------------
Diagnosed Type II Diabetes March 5 2001
Beating it with diet and exercise!
297/215/210 (to be revised lower)
58"/43"(!)/44" (already lower too!)
--------------------------------------
Visit my HomePage at http://members.shaw.ca/finkirv/
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http://members.shaw.ca/finkirv5/
--------------------
Irv Finkleman,
Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP
Calgary, Alberta, Canada

-- If it's a "new economy," why do they want my obsolete old money?



--
"Any sufficiently advanced technology is indistinguishable from
magic."

Arthur C. Clarke (1917 - ), "Technology and the Future"

From: (Dave=A0Hall)
*
"I've always accessed this group in the same

manner"

N3CVJ


_
Inside of 60 days:
=A0=A0209.120.200.73
207.103.222.114
24.229.62.109
Why don't you just behave, stop lying, and you won't feel like I'm
responsible for your misery and failures in life. For crying out loud,
you're as bad as Lelnad.

Twistedhed wrote:

From: (Dave Hall)
*
"I've always accessed this group in the same

manner"

N3CVJ

_
Inside of 60 days:
209.120.200.73
207.103.222.114
24.229.62.109
Why don't you just behave, stop lying, and you won't feel like I'm
responsible for your misery and failures in life. For crying out loud,
you're as bad as Lelnad.


Just once, I will try to explain this to you again, so listen real
closely, and pay attention.

I have used the same ISP to access this newsgroup since about 1996 or
97. My ISP is worldlynx networks. They provide the news server that I
use. That IS how I access this newsgroup. Within the last year or so,
worldlynx has updated their system, including outsourcing their news
server (slurp). With this change came the ability to access it without
having to dial into the system directly. So I can now access the
worldlynx news server from other internet means. I have always had the
ability to access the INTERNET through a T1 line, as well as my dialup
account. But Worldlynx is still my single point of access for this
newsgroup, and has been for many years now.

Dave
"Sandbagger"

On Fri, 29 Aug 2003 13:00:12 -0500, Scott Schrader
wrote:

that was semi-official repair policy for apple II computers in the
minnesota education system... turn it off, lift it up a foot or two, and
flat-foot slam it back on the table. oxidation and heat popping on the
tin-socketed chips, you understand, and the machine was well enough
built so you could get away with it.

But the skill is in where and how hard to hit it ;-)

Worked with a piece of production equipment I dealt with, with a relay
which stuck occasionally, no matter how many times it was replaced
(Note: never buy serial # 0001 of anything).

It was far simpler to kick it in just the right spot.

Happy trails,
Gary (net.yogi.bear)
------------------------------------------------
at the 51st percentile of ursine intelligence

Gary D. Schwartz, Needham, MA, USA
Please reply to: garyDOTschwartzATpoboxDOTcom