[Milsurplus] [ARC5] roller inductors

[Peter Gottlieb]

Yes indeed.  Try using TarnX on silver and you can smell the released sulphur.


On 1/25/2016 9:14 PM, Bill Carns wrote:
>
> 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 
> <mailto: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 Munson
>
>     WAVAG
>
>     513-919-1210 <tel:513-919-1210>
>
>
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