[R-390] Rebuilding canned multi-section capacitors

[paolo gramigna]

Hi all,

I'm very lucky, becose i can make use of a lathe. It is then very easy to
turn away the aluminum of the can just above the crimp on the base; then i
heat gently the can, and the whole content drops off.
Sometimes i was able to drill a very tiny hole in the pins, insert the
capacitor's leads in the tiny hole and finally crimp it with a crimping
tool; then i sealed the joints with a drop of thermo-glue, agains oxidation.
Very fast, since i spared the tapping job, and so far no problems; the
original leads were in fact crimped as well, in most of my cans.

Cheers,
Paolo


-----Messaggio originale-----
Da: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] Per
conto di tfrobase
Inviato: sabato 14 gennaio 2006 23.51
A: R-390 at mailman.qth.net
Oggetto: RE: [R-390] What I did on my winter vacation

I use a jewelers saw to cut the can, but like your pipe cutter approach.  I
then heat the upper area severed aluminum can with a propane torch,  just
enough to soften the goo and then pull the bottom out with the pins
attached.  I make the cut just above the crimp to the octal socket.  I have
used this process numerous times with consistent results ... Tom, N3LLL

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of odyslim at comcast.net
Sent: Saturday, January 14, 2006 2:31 PM
To: r-390 at mailman.qth.net
Subject: [R-390] What I did on my winter vacation

So Far, I re-built 14 multi-section capacitors. I did my project pretty much
the usual method everybody uses with only a couple of changes. I used a
large tubing cutter and made precise cuts along the bottom of the can.
After removing the can from the base, I screwed in a 3 1/4" long eye-hook
with 1/4 thread diameter all the way into the center of the muck.  I then
made a loop out of 1/4"  parachute cord about 3 1/2 ft diameter.I Put the
can in my vise with just enough overlap on the jaws of the vise to keep the
can from slipping through. After that, I attached the loop of cord to the
eye-hook, put my foot into the loop and pushed down. Like starting an old
Harley. The entire contents of every can popped right out. I then drilled
the pins out in the usual way. This was a good excuse to buy a nice bench
top drill press since I had 14 to re-build. I then did the standard 4-40 tap
job and installed the brass screws and finally soldered in the caps. I did
try a new ( to me ) ite  m I discovered called alu-weld with poor results.
The heat from the torch melted the base of the caps before the alu-weld
would solder the cans. Therefore I used  JB Weld.  
 I was installing quad 20 FP type cans to replace the older caps but decided
I would like to return the radios back to the original appearance. It made a
good winter project but did not last long enough. Now I guess it's shack
cleaning time :-)

 Scott W3CV
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