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Old 10-06-2014, 10:33 PM #1
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Default Attempted Non-Destructive Cleanup of a Sputtered Brewster Window

Just a lil something I've been up to.

Brewster Tube Internal Sputter Cleanup Attempt - YouTube


It didn't work, but was worth a shot. Got the tube for the cost of shipping.


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Old 10-15-2014, 07:18 AM #2
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Default Re: Attempted Non-Destructive Cleanup of a Sputtered Brewster Window

Interesting. I can't think of a good way to clean the window without removing it...but it would indeed make a nice lamp most MG brewsters run at 1400-1600V-ish, at 6.5mA depending on ballast.... probably someone who ran it reverse polarity or it has a bad connection to the cathode as you mentioned. Baking the tube is just going to kill it fast though....I wonder if there's a way to repel the aluminum off the surface? doubt it though, it looks like alot and its caked on pretty good.
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Old 10-15-2014, 09:39 PM #3
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Default Re: Attempted Non-Destructive Cleanup of a Sputtered Brewster Window

I'm not sure it is aluminium from the can either. I think it is from the brass/bronze lead-in cathode connection. It looks bronze in color on the window as well.
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Old 10-15-2014, 09:54 PM #4
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Default Re: Attempted Non-Destructive Cleanup of a Sputtered Brewster Window

might be zinc. and if that's the case, it's not coming off short of acid.
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Old 10-16-2014, 12:46 AM #5
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Default Re: Attempted Non-Destructive Cleanup of a Sputtered Brewster Window

Yep. 'Tis a lamp now (or will be when I get a spare hv supply - might make one if I feel like it) since the faulty cathode connection is a death sentence.

FWIW, -some- of the sputter had lightened in intensity from the RF torture. Blasting a tube meant for 12W with 300W will do that though.
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Old 10-16-2014, 12:57 AM #6
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Default Re: Attempted Non-Destructive Cleanup of a Sputtered Brewster Window

Yeah, it's probably done a number on the cathode as a whole.
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