Hi Tim,
Despite what the nay sayers might opine, I applied a good rubbing of steel
wool on my TH-3 before putting it up in 1992, with absolutely no fanfare...
What troubles me reading your post, though---and which was not alluded to by
other respondants---was the fact that some of your elements there have
"...bumps of white powder on them". That is a sure sign of trouble, indicating
that the aluminum has effectively "rusted," if you will, in those areas.
That is NOT good, and a sure sign of a weak link(s) in your set-up.
How extensive is this "powder" / oxidation...? Has it left deep pits / holes in
the aluminum below...?
~73~ de Eddy VE3CUI - VE3XZ
************************************************************************************************************************
On 2011-07-23, at 6:14 PM, k3hx@juno.com wrote:
> I'm rebuilding a TH-3 which has been stored under a shed for at least a
> decade. The elements are now oxidized to a dark grey with parts of the
> elements having bumps of white powder on them.
>
> The trap endcaps are blistered and split, replacements are on hand.
>
> I'd appreciate any hits, tips, pearls of wisdom, advice, cautions or
> experience the reader would care to share.
>
> In particular, I do not look forward to removing the oxidation from the
> elements with abrasive sponges although I'm willing to do so to assure a good
> job. Is there some manner of vile chemistry I can dip the disassembled
> elements into, perhaps in a long, shallow tray that will make the job less
> labor-intensive?
>
> Also concerned about the traps and assuring that they will not fail in
> service. (100w maximum, most of the time...QRP..HI!)
>
> Thanks,
>
> Tim
>
>
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