[ARC5] [Milsurplus] roller inductors

Tue Jan 26 11:52:39 EST 2016

SO the act of cleaning Grandma's silver set is actually destroying it?

    On Monday, January 25, 2016 10:34 PM, Bill Carns <wcarns at austin.rr.com> wrote:

 #yiv1011595241 #yiv1011595241 -- _filtered #yiv1011595241 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv1011595241 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv1011595241 #yiv1011595241 p.yiv1011595241MsoNormal, #yiv1011595241 li.yiv1011595241MsoNormal, #yiv1011595241 div.yiv1011595241MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv1011595241 a:link, #yiv1011595241 span.yiv1011595241MsoHyperlink {color:blue;text-decoration:underline;}#yiv1011595241 a:visited, #yiv1011595241 span.yiv1011595241MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv1011595241 span.yiv1011595241hoenzb {}#yiv1011595241 span.yiv1011595241EmailStyle18 {color:#1F497D;}#yiv1011595241 .yiv1011595241MsoChpDefault {} _filtered #yiv1011595241 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv1011595241 div.yiv1011595241WordSection1 {}#yiv1011595241 It should be noted regarding these instructions to “Clean off the oxide” with Deoxit on the roller inductor, that silver tarnish is NOT an oxide, but a Sulfide.  Silver Sulfide is CONDUCTIVE and is not the reason that the contacts are bad somewhere.  Using any cleaner may also remove dirt and other contamination and Deoxit is as good as several others at doing this.  I would use the DL100 Deoxit that does not have a small percent lubricant as does the D5 Deoxit.  It is best to not leave any lubricant or anything at all on the contact.   Many use just lab grade Isopropyl Alcohol for a cleaner.  I use both and they both seem to work equally well.   The following post in the thread after the Deoxit advice that suggest that the problem could be, and probably is, related to the follower spring contact on the contact bar is worth pursuing.  While polishing the heck out of those roller contact areas may make you feel good, and it sure looks nice, it is a fool’s errand for the following reason.  There is Sulphur in the atmosphere..  Some environments have it more than others.  That is why your mother’s Silver tarnishes. When the Silver Sulfide forms, it uses up (eats up) a monolayer or two of Silver. The Silver Sulfide is more or less self-limiting.  Once a layer of the Sulfide forms, it way slows down the process.  When you shine it up, you remove all the Sulfide – which includes that Silver Plate monolayer – and the process starts all over again – at high speed…  and the Silver plating gets thinner and thinner.  This is not desirable.  So, clean all the contaminants off the roller coil with either Deoxit or Isopropyl and then look for the other causes that may be there as suggested.  By the way, do not even think about using Silver Polish..  That is a disaster – especially Tarnex or similar acidic processes.  Bill  From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Dennis Monticelli
Sent: Monday, January 25, 2016 4:24 PM
To: Joe Munson <prc74b at fuse.net>
Cc: ARC-5 List <arc5 at mailman.qth.net>; Milsurplus <Milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] [ARC5] roller inductors  Joe,  I presume you are dealing with silver plate.  DeOxit is perfectly OK for removing the oxidation and not leaving behind a residue that is harmful to the inductor.  That's a lot of surface area so be prepared for repeat applications.  If you remove the inductor it's easier to deoxidize it.  If completely removed you could also go the silver cream route and then wash completely afterwards.  A coating of the Caig ProGold will keep the silver plate looking good.  Dennis AE6C  On Mon, Jan 25, 2016 at 1:41 PM, Joe Munson <prc74b at fuse.net> wrote:
I have noticed on most of my surplus equipment using roller indctors, Command Sets, TCS, BC 191/375,  Bendix TA 12, etc....all experience intermentent operation while moving the roller inductors with many dead spots. My questions to the group is how so porperely clean them.   I know not to use DEOXIT, or other contact cleaners that leave a deposit.  Years ago using Carbon TecnaChloride, (no longer available) seemed to do a fantastic job.  I have tried the new style CRC electyric parts cleaners but seem to not work too well.   I have wiped down the Rollers, the inductors, the roller shaft, the slip connectors, etcwith clean rags.  .   Still have intermentent operations.  Any Ideas? Joe MunsonWAVAG513-919-1210
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