I forced an RCA 811A tube to produce some X-rays by operating the tube in cold-cathode mode at about 20KV and 150uA. The glass fluoresces nicely, but I didn't get any light from my X-ray intensifier cassette.
MightyOhm's geiger counter kit: http://mightyohm.com/blog/products/geiger-counter/
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I'm, not sure if you've seen this article on making a cheap x-ray source, but it's a pretty interesting read!
http://www.noah.org/wiki/An_Inexpensive_X-ray_Machine
Supposedly, the old radio tubes that have a magnesium getter can be used for producing x-rays pretty well.
- Jordan
Not all tubes will produce X-rays.
Ref.
http://www.dangerouslaboratories.org/xray1.html
TG
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