On Wednesday 16 April 2008, John Kasunich wrote:
>Gene Heskett wrote:
>> I didn't time it John, but that sounds about right. I was up to my buns
>> in a different pool of alligators, the inner filament contact for a final
>> tube in a tv transmitter & had left it running itself while I went looking
>> for some silver braze rod. The only thing I have is some pretty old
>> nickle-silver rod whose flux has worn off from laying around. I have it
>> mostly fixed, but need to locate some chemistry for silver plating the
>> repair. Suggestions anyone?
>
>Depends on the shape of the part, but if its something simple that you
>can rub vigorously with a damp cloth you might try Cool Amp. It's a
>powder that is usually used for field plating of high current busbars.
>
>http://www.cool-amp.com/cool-amp.html
>
>I've used it with some success. Takes a bit of elbow grease, so it
>won't be suitable for complex or fragile shapes. Really intended just
>for busbars and such. But it is hard to beat for simple and easy.
>Clean the copper, rub the powder on with a damp cloth, rinse with water,
>done.
>
>John Kasunich
>
This piece is a brass concoction, crookedly screwed onto a piece of 5/16"
copper rod, about 1.5" long, about 3/4" OD, bored to 1/2" and turned to have a
side view of -----/\, but with the bottom of those slashes cut away by the
1/2" bore, then a dozen or so slits cut so that there are about a dozen
fingers that in turn plug into the center bottom connector of the high power
tube, and are supposed to fit tight enough so that this connector can be
inserted, and it has enough outward force from the fingers that the about 10
pound tube can then be picked up by the connector rod.
This one had apparently had a problem at some time in the past before Dave and
I came on the scene, and whoever worked on it before did not replace the
internal tru-arc snap rings that help supply the high contact pressures
needed to put 200+ amps though the connection reliably. I've cleaned the
burnt stuff off, and cut it down to clean bare brass, put the snap rings back
in, and now need to sit the end of it in about 1/2" of silver cyanide & move
silver in about a dimes volume, onto the repaired contacts. So I need the
silver cyanide, a small loop of silver wire I can place around it for the
sacrificial silver, and a few volts and amps to do the plating. Both are
made out of pure un-obtainium out here in the hills of WV.
Hopefully McMaster-Carr has that in small qty's. Off to check that right now.
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
I object to intellect without discipline; I object to power without
constructive purpose.
-- Spock, "The Squire of Gothos", stardate 2124.5
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