Re: Absurdly simple way to get contact cleaner into some Tek pots


Gary Robert Bosworth
 

Be careful where you drill that hole. It is easy to scratch and break the
resistive element. It is best to find an old discardable identical
potentiometer that you can open up to see where the critical pathway is so
you can avoid it.

Gary

On Tue, Apr 16, 2019 at 10:52 AM Richard Solomon <dickw1ksz@gmail.com>
wrote:

My foolproof method is to drill
a small hole on the top side at
the rear. Pump in De-Oxit Fader
Lube and seal the hole with some
black tape.

73, Dick, W1KSZ

On Tue, Apr 16, 2019 at 10:45 AM Terry Gray via Groups.Io <tlgray42=
yahoo.com@groups.io> wrote:

I also have restored 100's of "sealed"? noisy controls by pointing
the
control shaft straight up vertically, wrapping something around the
bottom
of the control to catch the excess contact CLEANER/LUBE, spray around the
base of the shaft where it goes into the control, and "pump" the shaft up
and down and give it time to "pump" the contact cleaner/lube down into
the
control---remember patience is a virtue. If at first it doesn't seem to
be
getting the spray down the shaft, make a dam" just below the point where
the shaft enters into the control and try spraying a little additional
cleaner/lube into that area keeping it saturated and at the same time
periodically "pumping' the shaft up and down to allow the cleaner/lube to
migrate along with capillary action down the shaft. Allow the
potentiometer
shaft to remain pointed up vertically. Sometimes it can take overnight or
longer to get the cleaner/lube down into the control but I have found
over
the last 50-60 years that it very, very rarely fails. Just be patient
and I
think this will work for you, even for the difficult ones. I remember
setting upright on their backs some of the big monster stereos and doing
just that, especially when the potentiometer access was not readily
accessible even with the long extended flexible tubing that sometimes
came
with the contact cleaner/lube or that were also available at the time.
I
also remember running into some well sealed potentiometers and TV tuners
that we had to drill a small access hole into/through the metal or
plastic
housing to get the cleaner/lube inside to do its job. Just be very
careful
to not drill into the tuner or control doing any internal damage. I
remember disassembling throw-away pots and tuners to learn where to drill
the holes to prevent any internal damage and you could then seal the hole
up with solder or glue when you completed the cleaning/lube process.
One
additional point, DO NOT use a contact cleaner with no lubricating agent
in
its ingredients. Many years ago I attended a Channel Master seminar on
their contact cleaners and tuner (and switch) cleaner/lubes. The company
representative showed us under a fairly high-powered microscope a video
of
what happens when you spray a contact cleaner (with no lube) on the old
TV
tuner switch contacts You completely wash away all lubrication from the
individual contact points and he showed us under the microscope what
happens when you rotate the switch thru the washed contacts. It scrapes
the
plating off the contacts and now being unplated in that area it is
oxidizes
and you end up with intermittent high resistance contacts down the
line(with time) that play havoc with your circuit. You think that you are
"fixing" the intermittent switch contact(s) (or the intermittent internal
potentiometer wiper problem) but in reality you are totally ruining (for
the future) whatever you are so-called restoring by using a
non-lubricated
spray. I wish the video that the Channel Master rep showed us was still
available>>>>it looked like a chisel scraping the plating off the contact
under the high-magnification microscope when all the lubrication had been
previously "cleaned" off the contact areas. He said DO NOT EVER use a
contact cleaner that has no lubrication in it or at least follow up the
"cleaning" process by spraying or adding some additional lubrication to
the
contact points. Hope this is helpful information to some of you, it
sure
was for me.
On Tuesday, April 16, 2019, 9:51:07 AM CDT, Bob Koller via Groups.Io
<testtech=yahoo.com@groups.io> wrote:

Try it sometime, I have literally done hundreds this way. Some last
week..







--
Gary Robert Bosworth
grbosworth@gmail.com
Tel: 310-317-2247

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