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Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
I cannot find anything on the internet showing how this tube is made. Here is a datasheet:
Anyway, i found some on eBay for a steal, and i was wondering about the ability to produce X-rays.
They are not planar like the popular tube sometimes used for x-rays, the 6VS-1, but if this was run hard enough, i suspect it would also generate copious amounts of X-rays. The question is, what would the beam look like? Would it be a nice radial output that could be attenuated into a smaller spot for better X-rays, like the 6VS-1? Or, would the X-rays be totally random and useless?
I will hopefully be getting some 6BC-1 tubes, but these have higher dissipation and i can get then extremely cheaply, so i would like to try them. If all else fails, i could attempt flash X-rays, but i would like to try the same CW setup that is commonly used with other stabilizer tubes.
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
From the pictures I was able to find, it seems they have a similar structure to common TV HV shunt stabilizer tubes, so I suspect the x-ray performance will be similar, if they can handle high enough voltage. In any case, the focal spot size is going to be quite big, so x-ray pictures aren't going to be terribly sharp. As they are only intended to be operated at 5kV max, they aren't very likely to be x-ray shielded, so that's a plus.
6BC-1 and 6VS-1 are the same tube (they are marked 6BC-1, with the cyrillic letters B and C, which are sometimes translated to V and S).
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
6VS1
6e15P
My advice: don't waste your money on 6e15P. It does not have the specialised beam-forming plates of 6VS1, and was designed to operate at 5kV, while shunt stabiliser triodes PD500, 6BK4A, and 6BK4B are designed to cruise at 25kV with the heater on.* The point is that these valves produce X-rays within their normal design limits, while 6e15P will not.
2X2A, a high voltage diode rectifier, is often mentioned as a copious X-ray emitter in over-volted cold cathode mode, though I have not tried it myself.
As you would expect, valves used in this way are not isotropic radiators. Their X-ray emission pattern consists of multiple clover-like lobes, corresponding to the electrode geometry of the valve.
You can reduce the virtual focal spot size of diffuse emitters by collimation through successive pin holes or slits, but you will lose most of your rays.
*PD510 and 6BK4C are reduced X-ray emission variants of their respective series, manufactured as a response to the 'radioactive TV' scare of the late 1960s.
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6e15P high voltage stabilizer internal structure?
