hey mike, i have this unit, ground one of the leads otherwise nothing much
will happen.
On Sun, Jan 28, 2018 at 8:20 AM, undisclosed recipient via Tesla <
tesla@xxxxxxxxxx> wrote:
> There are dozens of Xray transformers listed on craigslist.
> Most of the units do work or the damage is minimal.
> I just couldn’t afford to get one since I can’t land a job around here.
>
>
>
>
> > On Jan 28, 2018, at 6:33 AM, Michael Loundry <michael.loundry@xxxxxxxx>
> wrote:
> >
> > Hello,
> >
> > thank you for the reply.
> >
> > No, I have not tried it, but I can try.
> > I was checking the vacuum tube through the network camera to observe
> what is happening and I can just tell that brightness of the filament is
> never changing.
> >
> > When any X-rays are present, I should be able to see some dots on the
> screen. But there is none. So for me this is third confirmation that it is
> not generating any X-rays.
> > But again I am convinced that the tubes are OK.
> >
> > I have ordered DC power supply that could supply 0 - 100kV and 8mA. I
> believe that the problem is in the powering.
> > If this will fail, then we can be certain that the problem is not there.
> > At the same time it should not generate any strong RF.
> >
> > Maybe in 3 days I will know.
> >
> > I will let you know.
> >
> >> Sent: Sunday, January 28, 2018 at 3:19 AM
> >> From: Ed <evp@xxxxxxxxxxx>
> >> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> >> Subject: Re: [TCML] Tesla Coil and X-ray tube
> >>
> >> Have you tried measuring current by putting a DC milliameter in series
> >> with the anode and observing current as you vary filament voltage?
> >> Meter needs to be bypassed with something like a 1 ufd ceramic capacitor
> >> for protection.
> >>
> >> ED
> >>
> >>
> >> On 1/27/2018 1:18 AM, Michael Loundry wrote:
> >>> Thank you Dave!
> >>>
> >>> I agree in all points with you.
> >>>
> >>> I have made also a tests with Flyback 15KV from CRT.
> >>> DY87 tube was giving approx. 15% more counts than with background.
> There is just blue glow visible.
> >>> TRX708 tzbe was not giving anything. No glow visible at all.
> >>> Some time ago I have made my own vacuum tube that was made of
> stainless steel tube with a rod in the center. This gave 10x background
> with the Flyback.
> >>>
> >>> All tubes are giving just RF similarly as with a rectifying diodes.
> Which tells me that it is doing something.
> >>>
> >>> I have to admit that all detectors are sensitive to RF to some extent.
> So it could add counts or even decrease. But it is again in a very small
> range (5 - 20% change) But still I can see Energy spectrum of all counts.
> And there is never characteristic X-rays visible.
> >>> The RF from the Tesla Coil is so strong that all nearby electronics is
> failing. So it would be good to shield it in some way.
> >>>
> >>> I am sure that TRX708 tube has no air inside, since it is behaving all
> the time as perfect insulator. The Tesla Coil is producing humming as if
> there is too big gap (no current is flowing) however I connect it. If there
> is a short or at least some current is flowing the sound is very different.
> >>> I have tried to measure filament emmisivity and I can measure voltage
> between Anode and Cathode when only filament is under power.
> >>>
> >>> So I am pretty confused because with both HV supplies it looks like
> there is no electron flow inside with the TRX708, thus no circuit. Both
> Flyback and Tesla Coil have no current flow between Anode/Cathode. So the
> vacuum is pretty good I think.
> >>> On the other hand supplier of the tube tested it with 70KV HV supply
> and is sure it is perfectly OK. But his DC supply seems to be much better.
> >>>
> >>> But why it is giving off RF if no current is flowing? I dont
> understand it. Probably the current is very, very small.
> >>>
> >>> I have to also admit that my Tesla Coil is not able to light up also
> any light bulb. There is just arc through the entire bulb or there is
> nothing (depending on configured voltage). No glow at all. This is reason
> why I think there is something wrong. Ends from the secondary are so that
> one is touching filament and second end is at the top of the bulb.
> >>> My tesla coil is not grounded and that is probably reason since I know
> that with other Tesla Coils I have saw it arcs everywhere inside the bulb
> just by touching one end. But probably everybody is grounding the coil
> which is what I dont wish to do.
> >>>
> >>> I have full schematic of my Tesla Coil so you can look at this:
> >>> https://ibb.co/gWyZgw
> >>>
> >>> By the way it is fully shielded with 3+ mm of Pb so that nothing can
> escape. Also time that it is running is just few miliseconds.
> >>>
> >>> Does it make any sense for you?
> >>>
> >>>
> >>>> Sent: Friday, January 26, 2018 at 11:54 PM
> >>>> From: "David Speck" <Dave@xxxxxxxxxxxxxxxx>
> >>>> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> >>>> Subject: Re: [TCML] Tesla Coil and X-ray tube
> >>>>
> >>>> Michael,
> >>>>
> >>>> According to this table:
> >>>>
> >>>> http://www.sciencemadness.org/talk/files.php?pid=400982&aid=38982
> >>>>
> >>>> your 9 cm arc between sharp electrodes should be indicating about 70
> kV,
> >>>> which should be enough to make X-rays.
> >>>>
> >>>> Even without external rectifiers, an X-ray tube is capable of
> operating
> >>>> in self-rectifying mode on an unrectified AC source. It would
> produce a
> >>>> lot of unwanted, scattered radiation on the reversed biased part of
> the
> >>>> cycle, but it should still produce plenty of X-rays when forward
> biased.
> >>>>
> >>>> Have you checked for X-ray output with a foolproof X-ray detector like
> >>>> an X-ray sensitive phosphor sheet from a medical X-ray cassette? Have
> >>>> you been able to see any faint green fluorescence of the tube walls
> >>>> during operation?
> >>>>
> >>>> How can you be certain that your X-ray detectors are working properly?
> >>>>
> >>>> From what I've read on the Geiger Counter Enthusiasts Usenet groups,
> >>>> ionization chamber radiation detectors are the preferred devices for
> >>>> detecting and measuring X-rays in the energy range that you indicated.
> >>>>
> >>>> In the circumstances you describe, I would speculate that either your
> >>>> tubes are up to air, and not producing X-rays, or that your detectors
> >>>> are not working.
> >>>>
> >>>> See if you can find a sympathetic dentist to direct his X-ray machine
> at
> >>>> your detectors to be sure that they are actually working. Typical
> >>>> dental X-ray machines run in the 88 - 100 KV range.
> >>>>
> >>>> Be careful. 70 KV X-rays will produce a substantial skin dose while
> >>>> being imperceptible.
> >>>>
> >>>> Dave
> >>>>
> >>>>
> >>>> On 1/26/2018 8:20 AM, Michael Loundry wrote:
> >>>>> Dear subscribers,
> >>>>>
> >>>>> I have recently bought Tesla Coil with adjustable output voltage 5 -
> 100kV.
> >>>>> It is driven by thyristor (SCR) circuit and powered from the mains.
> >>>>> Tesla coil itself is in mineral oil. Secondary has both ends
> available from the plastic case, so there is no grounding.
> >>>>> It is this unit: http://i.ebayimg.com/images/i/
> 311006967911-0-1/s-l1000.jpg
> >>>>> The Tesla Coil seems to be powerfull enough - can produce a lot of
> ozone, arcs can be at least 90mm long.
> >>>>> Input power is around 200W.
> >>>>>
> >>>>> I would like to ask you, if you think that with this Tesla Coil I
> should be able to produce X-rays?
> >>>>>
> >>>>> What I have?
> >>>>> - Proper lead shielding
> >>>>> - NaI 2.5x2.5" scintillator probe with sensitivity for 15keV - 3MeV
> >>>>> - Additional Geiger Counter with sensitivity from 50keV - 3MeV
> >>>>> - X-ray tube Trophy/Kodak TRX708
> >>>>> - Vacuum tube DY87
> >>>>> - 20x rectifier diode for 18KV, 20mA (can be connected in a series)
> >>>>>
> >>>>> My goal is to produce X-rays, but unfortunately I am not able to do
> so in any case.
> >>>>> Both X-ray tube and vacuum tube are basically new and verified to
> work.
> >>>>>
> >>>>> What I have tried:
> >>>>> 1. Heating filament with AC/DC to nominal current/voltage for
> maximum electron emmisivity.
> >>>>> 2. Connecting TC to Anode and Cathode.
> >>>>> 3. Changing TC polarity on the panel (this is swapping live/neutral
> for the primary side).
> >>>>> 4. Using rectifying diodes so that output is pulsed DC.
> >>>>> 5. Swapping Anode and Kathode wires.
> >>>>> 6. Tried to change filament voltage from 0 to max allowed.
> >>>>> 7. Tried same procedures with DY87.
> >>>>> 8. Tried it with arcing (wire for cathode had a small gap to create
> arcs).
> >>>>>
> >>>>> Of course collimator from the X-ray tube is positioned parallely to
> radiation detectors.
> >>>>>
> >>>>> What I was able to produce was just RF in some cases.
> >>>>>
> >>>>> Could you please let me know what could be wrong? Why my Tesla Coil
> is not producing any X-rays? Is some grounding required?
> >>>>> I know my meters can pick X-rays pretty well.
> >>>>>
> >>>>> Thank you!
> >>>>> _______________________________________________
> >>>>> Tesla mailing list
> >>>>> Tesla@xxxxxxxxxxxxxxxxxx
> >>>>> https://www.pupman.com/mailman/listinfo/tesla
> >>>>>
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> >>>>
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