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Author: Subject: Platinum electrodes from Radio Vaccum Tubes?
ktw_100
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[*] posted on 28-4-2006 at 09:33
Platinum electrodes from Radio Vaccum Tubes?


I was just wondering about getting platinum from the anodes/plates of some larger vacuum tubes from old radios. Seems to me that the grids in these tubes might be good for making electrolysis anodes/cathodes. Also, what about other larger CRT's. Anybody ever tried this?
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12AX7
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[*] posted on 28-4-2006 at 10:11


Hmm, not familiar with Pt- they're usually nickel, copper or tungsten. Nickel is preferred for a lot because it outgasses easily in processing. Of course, Ni isn't nearly expensive enough to tear up poor old tubes for.

Tim




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The_Davster
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[*] posted on 28-4-2006 at 14:35


I read your post this morning, then this afternoon I had the opportunity to acquire dozens of vaccuum tubes for free:D. I don't really need them, but I am a sucker for free stuff....

Would have been nice if they did contain some precious metal...




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a_bab
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[*] posted on 29-4-2006 at 13:03


They usually contain a very small quantity of Ba, with the role of degasing. You can see it on the oposite side of the pins, as a blackish mirror deposited on the glass.
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12AX7
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[*] posted on 29-4-2006 at 16:15


FWIW, the ring (or strip or whatever) that the barium is evaporated from, I've tried induction heating the getter inside sealed tubes and nothing appears to come off, it's a good bet they evaporate everything at manufacture.



Tim




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The_Davster
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[*] posted on 29-4-2006 at 16:50


Tim in your picture I am assuming it is of a tube being beld in a coil for induction heating?

To get slightly off topic, what is the basic design of your induction heater Tim? I have been thinking of making one with a NST, 15kv, 1uf cap, and a spark gap.




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12AX7
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[*] posted on 29-4-2006 at 18:45


http://webpages.charter.net/dawill/tmoranwms/Elec_IndHeat6.h...
Also check out the other pages. You'll find that pic on the 2nd page or so.

In particular, I think that was a 12AT7 type.

Tim




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