A Nutter And Home Made Xray Tube  - Page 1
Forum section: electronics / general

author: Sionyn
author_rank: Frequent Contributor
timestamp: May 17, 2012, 10:11:42 am
content: a new nutter,

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 17, 2012, 01:01:52 pm
content: fascinating

author: Time
author_rank: Frequent Contributor
timestamp: May 17, 2012, 05:51:30 pm
content: horrible camera skills

author: G7PSK
author_rank: Super Contributor
timestamp: May 17, 2012, 07:41:03 pm
content: He certainly does not have the flair of the Frenchman who makes Valves (Tubes) but still very interesting and more power to his elbow for doing it and putting it on you tube.

author: bradleytron
author_rank: Regular Contributor
timestamp: May 18, 2012, 05:38:00 am
content: This was amazing to watch, and his skills with the glass work! Too bad these kinds of folks are fading away with all that industrial automation. The previous two universities I worked for both had glass blower shops but fewer and fewer people with the skills to man them.Thanks for the great video and I hope the fellow is monitoring his exposure with a dosimeter badge, he seemed a little free and lose with the exposures (time and distance).

author: G7PSK
author_rank: Super Contributor
timestamp: May 18, 2012, 03:31:41 pm
content: This man has far more panache when making his valves/tubes.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: May 19, 2012, 02:10:09 am
content: Quote from: bradleytron on May 18, 2012, 05:38:00 amI really, really want to do something like this. I have no idea where to start, or where to learn in my area.QuoteAccording to the YT comments, he did pay attention to it.

author: Pentium100
author_rank: Frequent Contributor
timestamp: May 20, 2012, 08:50:42 pm
content: Quote from: Steaphany on May 20, 2012, 06:15:44 pmYes, it will, however, the X-Rays will be very low energy (the guy used 10-40kV to power the real X-Ray tubes, audio tubes usually use up to 300V), also the electrode configuration is usually so that the X-Rays stay within the anode. Still, a tube with open anode (for example, 6AS7) can make the glass glow blue, but I doubt there are X-Rays above background.

author: tekfan
author_rank: Frequent Contributor
timestamp: May 20, 2012, 09:00:23 pm
content: Quote from: Pentium100 on May 20, 2012, 08:50:42 pmIf you want instant X-Rays just disassemble an old CRT TV. They often have anode voltages of more than 30kV. If you actually look at the neck of the tube where the electron gun is you can even see a slight blue halo inside where the ionization is occuring.

author: AntiProtonBoy
author_rank: Frequent Contributor
timestamp: May 21, 2012, 01:38:54 am
content: Quote from: tekfan on May 20, 2012, 09:00:23 pmIf you see that, then you have a leaky tube.

author: siliconmix
author_rank: Frequent Contributor
timestamp: May 21, 2012, 07:39:25 am
content: he isn't going to worry about that level of radiation at his age

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 21, 2012, 07:51:27 am
content: Quote from: siliconmix on May 21, 2012, 07:39:25 amCould be sustaining him for all we know.

author: SeanB
author_rank: Super Contributor
timestamp: May 21, 2012, 04:24:46 pm
content: CRT glass is normally a very heavily leaded glass to block most of this emission from the front. It is pretty thick in front, and most of the radiation is actually out the back and side of the CRT. They were all tested during certification for emission levels below the allowed limits. Basically if you wrapped yourself around a powered tube for a year, and did not get shocked by the final anode, then the exposure would be roughly equal to a single dental X ray.

author: G7PSK
author_rank: Super Contributor
timestamp: May 21, 2012, 08:26:47 pm
content: My father had a cousin in the RAF during WW2, He sat in a radar trailer looking at a CRT for hours on end it gave him testicular cancer from which he died, the CRT of those days gave of a lot of radiation.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: May 22, 2012, 09:11:44 am
content: Quote from: G7PSK on May 21, 2012, 08:26:47 pmNuts!

author: SeanB
author_rank: Super Contributor
timestamp: May 22, 2012, 07:46:36 pm
content: Yes, ordinary soda glass, no lead, and a lot of high voltage vacuum tubes as well in close proximity. Leaded glass was introduced later, after the hazards of ionising radiation was realised.

author: G7PSK
author_rank: Super Contributor
timestamp: May 22, 2012, 08:24:11 pm
content: Also the long persistence phosphors contained things like radium etc to keep the image stable as the beam swept around.

author: siliconmix
author_rank: Frequent Contributor
timestamp: May 23, 2012, 08:48:26 am
content: here's our friend again on the last stage of making a fleming tube.i like this bloke he's ok.it just makes me worried when i see him using a table saw.ouch