[Milsurplus] Re: Milsurplus - Switch cleaning restoration advice from the Group

[john p hutchins]

Group -

Thank you all for your advice.  I had some contact cleaner from 
Autozone, cheap
$1.79 a can.  Its been a while since I have tinkered with my old Mil stuff.

Re-read all the URM-25D re-building info on the web I could find.
http://site298.webhost4life.com/barryhauser/archives/HSN-TestEQ.pdf
http://www.qsl.net/k5bcq/URM/URM.html

Some Good stuff! 

Ok I Ohm'ed out the switch pin-by-pin it turned out solid.  Also cleaned 
all the
tube contacts pin-by-pin.  Adjusted the modulation resistor.  Boom - 
tones on
400~ and 1000~ positions, and 1mc Crystal Osc. beat notes!

Any one have any experience on overhauling the URM-25D your comments 
would be
appreciated.

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You may Email me directly if you do not want to crowd up the 
[Milsurplus] post.
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1.  Any Ideas on replacing the .25uf stand off caps in a can?  Attemting to
    maintain the "standoff" and replace the cap.  May be "re-build" the cap
    by putting a new cap inside the can?  The standoff can cap was used 
for a
    reason other than standoff pin.
2.  How to get the 3 sections in the main  casting housing out to replace
    the paper-oil caps with as little de-soldering as possible.  Man its 
tight!

Thanks  All
John Hutchins




Marty Reynolds wrote:

>First, pardon the delayed response.  Mailman reflector regurged on 1st try
>because it thot embedded spaces in subject line meant ... .--. .- --
>
>= = = = = = =
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>John in conclusion u wrote
>
>  
>
>>Im looking for any thoughts on cleaning techniques, tools or chemicals
>>to safely clean the switch.
>>    
>>
>
>
>John I'm dumbfounded by the DeOxit craze.  $18 for a treeny can of stuff
>which @ Dayton was deemed a bargain.  Pep Boys sells 16oz cans of
>their stuff for $3.99 that smells the same
>
>DeOxit has become such a fad that there may be a market for DeOxit drip
>pans to recover juice from regularly-treated sets.  Sorta like they
>place under certain acft while parked.
>
>I THINK most switch trub comes from "clamp contacts" that have
>taken a set after a half century.  Relaxed is another descriptor
>
>Relaxed or not, accelerated cleaning might be tried with a piece of
>stiff cambric paper scootched between the teeny contact jaws.  That's
>helped me b4.
>
>Last gasp is pushing the teeny contact jaw a bit out of plumb so it'll
>snug up when the blade comes by.
>
>Love to see other opinions
>
>    Drip-tray 'rm
>
>
>
>  
>