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#1
08-07-2007, 02:40 AM
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How to light up a Crookes tube?
I don't know if this is the right place to post this, but it is kind of related to TVs, so...
I found this "Crookes tube" and i want to test it. It probably still holds vacuum. The big question is, what voltage should i use? AC or DC? Someone thought about 2kV, and if they is right, may the focussing lead in an old B&W computer monitor be a usable supply? Last edited by larschr; 04-16-2009 at 05:09 AM. 
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#2
08-07-2007, 11:38 AM
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You could try contacting John Jenkins, who has quite a collection of Crookes and Geissler tubes.
http://www.sparkmuseum.com/GLASS.HTM Phil Nelson
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#4
08-08-2007, 10:26 AM
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I recall playing with one in HS physics...seem to remember about 3-4kV doing the job. Much higher voltages would probably emit x-rays.
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#5
08-08-2007, 05:04 PM
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X-Rays don't become much of a concern until the voltage gets above 15KV. And even at that voltage, only long term exposure would be a concern.
__________________
John Folsom
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#6
08-26-2007, 04:03 AM
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It lives!
Yesterday i hooked it up to the EHT lead in one of those small, junky TV/radio combos. I think the voltage is too high, but at least i know that the tube is working. I just "zapped" it for a couple of seconds to take a picture of it.
Last edited by larschr; 04-16-2009 at 05:16 AM.
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#8
08-26-2007, 08:10 AM
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woah.. .that is too cool... I've only seen pictures of those, and only unlit... I had no idea they looked so cool with voltage..
So what would a person end up doing with one of those? Just for a conversation piece around the den or office?
__________________
Big ass speakers with too much power, and nowhere to go fast... Altec A7-500; Peavey SUB118-HC Modded Quicksilver 8417 Mono Amps; Tapco J1400 Behringer MX2004X; Tapco T-231; Peavey VSX; Pioneer SR-303 Technics SL-1200MKII; Pioneer RT-701; Yamaha CDX-1030; KLH Model 18
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