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    FM-3 Tube Shields - How to clean?

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    aguaazul

    Posts : 98
    Join date : 2012-07-08
    Age : 58
    Location : Livermore, CA

    FM-3 Tube Shields - How to clean?

    Post by aguaazul on Sat Sep 08, 2018 2:25 am

    I'm wondering if someone has a method for cleaning the FM-3 Tube Shields.

    What are the made of?

    Anybody know any tips to clean them up?

    Thanks,

    Aguaazul
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    DynakitParts
    Admin

    Posts : 203
    Join date : 2008-11-30

    Tube Shields

    Post by DynakitParts on Sat Sep 08, 2018 10:10 am

    These are made of aluminum.....When new they may have had a clear anodized finish to inhibit oxidation. A metal cleaner suitable for aluminum should work OK....You could also purchase new ones from any number of tube suppliers......Kevin
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    aguaazul

    Posts : 98
    Join date : 2012-07-08
    Age : 58
    Location : Livermore, CA

    Re: FM-3 Tube Shields - How to clean?

    Post by aguaazul on Sat Sep 08, 2018 8:48 pm

    I thought that is what they were made of. Thanks Kevin.
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    Peter W.

    Posts : 966
    Join date : 2016-08-07
    Location : Melrose Park, PA

    Re: FM-3 Tube Shields - How to clean?

    Post by Peter W. on Tue Sep 11, 2018 7:00 am

    DynakitParts wrote:These are made of aluminum.....When new they may have had a clear anodized finish to inhibit oxidation. A metal cleaner suitable for aluminum should work OK....You could also purchase new ones from any number of tube suppliers......Kevin

    Uh... no.

    Modern tube shields may be made of aluminum, but back in the day, they were made from tin-plated spring steel. The tin plating was very thin, and the shields often rusted as a result. The best way to clean these shields is with Naval Jelly or the functional non-abrasive equivalent, after which they may be replated or simply put back. Do not use abrasives, emphatically not steel wool, so as not to leave shavings about.

    Try with a magnet - if you pick up the shield, it is tin-plated steel. If not, aluminum. If aluminum, they may be cleaned by dipping in a hot solution of Cream-of-Tartar, then polished with a Scotch-Brite pad, somewhere in the next room, then washed and rinsed.

    https://www.eastwood.com/ew-electroplating-system-tin-zinc.html?SRCCODE=PLA00020&gclid=Cj0KCQjwz93cBRCrARIsAEFbWshE4hGU78VUkG99buigHcetxNcKpGEqE9CU3N6O7FmdzUYOpavX9oIaAs0tEALw_wcB
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    aguaazul

    Posts : 98
    Join date : 2012-07-08
    Age : 58
    Location : Livermore, CA

    Re: FM-3 Tube Shields - How to clean?

    Post by aguaazul on Tue Sep 11, 2018 11:45 am

    Thanks Peter, looks like I am learning electroplating.

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