[Milsurplus] Re: Milsurplus - Switch cleaning restoration advicefrom the Group

[Barry Hauser]

Hi John & Gang

FYI -- the simpler URL for the web site is http://www.hollowstatenews.com

We have all the issues of Hollow State Newsletter on there for free 
download.

Can I interest anyone in writing an article?

regards,
Barry




----- Original Message ----- 
From: "john p hutchins" <olegerityincj at austin.rr.com>
To: <milsurplus at mailman.qth.net>
Sent: Wednesday, May 24, 2006 8:55 PM
Subject: [Milsurplus] Re: Milsurplus - Switch cleaning restoration 
advicefrom the Group


> 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.
>
> @@@@@@
> You may Email me directly if you do not want to crowd up the [Milsurplus] 
> post.
> @@@@@@
>
> 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 ... .--. .- --
>>
>>= = = = = = =
>>
>>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
>>
>>
>>
>>
>
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