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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Nah wrote ...
Yeah, 01a tubes are great for x rays, just don't use good ones please!
Um, X-ray.......
don't you think it wasn't the best idea to operate that in a house.......
I know kids did dumb things, I did too, but....
What is so bad about X-rays in a house? Being close to said X-rays is the bad part
The cheapest way i know of to make fair x-rays is high voltage stabilizer tubes, like the 6VS-1. I got 2 6BC-1's (6vs-1's equivalent) for something like 20 dollars. Im not sure why i cannot find the xray stuff on Leslie Wright's (plazmatron here on 4hv) webpage, but here is another page using the same tube That uses a CCD to make the xray images. A better way is to buy a cheap (i got mine for 10 dollars) X-ray cassette from eBay. The same guy has done that, too:
If you do get a tube similar to that, don't use as much power as that guy did. If you use an intensifier screen from an Xray cassette, you won't need that much power for most items anyway. These tubes are made for less than 4 watts of dissipation on their tiny plate, exceed that and you risk melting a hole in the plate. Something like 30kv at 100-200uA will be sufficient, and will increase reliability. Also, that would be perfect for a flyback. You could even use the focus and screen outputs for that tube's grids, provided the voltages are right (you can adjust it with the pots)
By the way, x-rays aren't produced when a stream of electrons hit the glass envelope, it is when they collide with the anode. Perhaps you should read up on X-rays, like, a lot before attempting them. I bought those tubes, but still have not used them. I don't feel like i am ready for them yet (and i cannot find a good way to make my lead box out of this lead i have ) . It is easy to say that you can take care of yourself and that you have enough measuring equipment, but talk is cheap. Chemotherapy and other treatments for cancer which will still inevitably limit your lifespan aren't so cheap. As much as you have probably seen people say this, just assume i am right to be on the safe side
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Arcstarter wrote ...
By the way, x-rays aren't produced when a stream of electrons hit the glass envelope, it is when they collide with the anode. Perhaps you should read up on X-rays, like, a lot before attempting them. I bought those tubes, but still have not used them. I don't feel like i am ready for them yet (and i cannot find a good way to make my lead box out of this lead i have ) . It is easy to say that you can take care of yourself and that you have enough measuring equipment, but talk is cheap. Chemotherapy and other treatments for cancer which will still inevitably limit your lifespan aren't so cheap. As much as you have probably seen people say this, just assume i am right to be on the safe side
(insert disclaimer here)
Actually x-rays can be produced that way. They are made when a stream of electrons hits anything hard, glass included.
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Nah wrote ...
Yeah, 01a tubes are great for x rays, just don't use good ones please!
Um, X-ray.......
don't you think it wasn't the best idea to operate that in a house.......
I know kids did dumb things, I did too, but....
During my exposures, I had my X-ray machine in a separate room in which I closed all doors and opened the windows to allow ventilation. I was fully aware of the hazards of Ozone, and I knew how to limit scattered X-rays with shielding.
I always practiced being safe when it came to X-rays and high voltage. Just ask my son if you don't believe me (He's the furry kid with three eyes under his left arm and a foot growing under his chin).
Registered Member #3429
Joined: Sun Nov 21 2010, 02:04AM
Location: Minnesota, USA
Posts: 288
Nah wrote ...
Also, did you use globe 01A tubes or ST (coke bottle) ones? I think that globe (balloon) tubes would be better suited.
You can get dud globe tubes for around $1-2 each if you shop.
Don't use 00 tubes, they are filled with argon and won't work.
ST coke bottle ones??? I've never heard of that type. If memory serves me (and it rarely does) the tube was a 201A. I believe that the leftmost digit indicates the manufacturer. Anyhow, it's shape was sort of like a hot-air balloon. Most of the inside surface of the glass was coated with a mirror-like metalic substance (maybe magnesium?). It was my understanding that the electrons hitting that internal metal coating is what produces the X-rays, and the aluminum foil covering just gives the electrons an electrode to be attracted to. The aluminum foil also provides some filtration which limits the low energy photons. I remember that the metalic coating gets blasted off ofter some time period, and X-ray production gets lower over time.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
The use of the long obsolete valve 01 as an X-ray source was described in
Stong C.L. (ed) An Inexpensive X-ray Machine,The Scientific American Book of Projects for The Amateur Scientist Section IX, Ch 3, 1960
and has been extensively discussed in this forum in the past, where a search will find it.
The images formed with this source, and illustrated in the book, are of very poor quality, which is all that can be expected from the extensive, diffuse anode focal spot formed on the magnesium getter deposited inside the bulb. Mg, as a low Z element, is an inefficient producer of X-rays, so long exposure times were needed with this Oudin coil-powered contraption.
The capacitor formed by the glass dielectric between the Mg getter on the inside of the valve and the aluminium foil on the outside had a sufficiently low impedance at the frequencies of the Oudin coil to allow a small RF current to pass. I'm sure the electrons concerned didn't know whether they were coming or going half the time.
I would not encourage anyone without a good theoretical and practical grasp of radiological protection to copy these experiments.
The production and use of X-rays is regulated in all developed nations, and it is your own responsibility to find out what laws and regulations may be in force in the jurisdiction where you are domiciled.
Registered Member #3567
Joined: Mon Jan 03 2011, 10:49PM
Location: USA, 1960s
Posts: 260
Xray wrote ...
Nah wrote ...
Also, did you use globe 01A tubes or ST (coke bottle) ones? I think that globe (balloon) tubes would be better suited.
You can get dud globe tubes for around $1-2 each if you shop.
Don't use 00 tubes, they are filled with argon and won't work.
ST coke bottle ones??? I've never heard of that type. If memory serves me (and it rarely does) the tube was a 201A. I believe that the leftmost digit indicates the manufacturer. Anyhow, it's shape was sort of like a hot-air balloon. Most of the inside surface of the glass was coated with a mirror-like metalic substance (maybe magnesium?). It was my understanding that the electrons hitting that internal metal coating is what produces the X-rays, and the aluminum foil covering just gives the electrons an electrode to be attracted to. The aluminum foil also provides some filtration which limits the low energy photons. I remember that the metalic coating gets blasted off ofter some time period, and X-ray production gets lower over time.
Hello!
Tubes were created woth different shape glasses, yours being a globe tube (called balloon tubes across the pond). You are right, the left most does tell the maker, in this case it was RCA.
Now, in the late 20's, early 30's, the globe tube was out, and ST was in. Tubes have been standardized fully by then, so there wan't a 2 or 3 number anymore. So, the tube was called 01a.
Link to globe tube-http://us.ebid.net/for-sale/rca-ux-245-
balloon-globe-vacuum-tube-45-345-
42567287.htm
Link to ST-http://cgi.ebay.com/807-RCA-ST-Vacuum-Tube-
VINTAGE-RADIO-TUBES-AMPLIFIER-/120735957095
(ST stands for shoulder type)
In case you were wondering, there was a 01 tube. It was a 01a with a 1 amp filliment instead of a 1/4 amp.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
According to Stong op. cit. (1960),
"The machine, when in operation, will produce a beam of X-rays easily detected for a distance of several feet in all directions. (My emphasis - Stella) With ‘r’ meter measurements we determined the intensity of the rays to be three fourths of a Röntgen unit per minute at a distance of three feet.â€
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x-ray tube voltage?
) . It is easy to say that you can take care of yourself and that you have enough measuring equipment, but talk is cheap. Chemotherapy and other treatments for cancer which will still inevitably limit your lifespan aren't so cheap. As much as you have probably seen people say this, just assume i am right to be on the safe side 
