[Boatanchors] [Milsurplus] "Blue Glow" mystery.

[J. Forster]

1 mA of current in an x-ray tube is a LOT.

-John

===================


> David - are you sure there is *no* current flowing? Would only take a
> microamp or so to produce enough X-rays to excite a visible process
> in the glass, I would imagine.
>
> 73, ian K3IMW
>
>
>
> On Mon, Apr 21, 2014 at 8:40 AM, David Stinson <arc5 at ix.netcom.com> wrote:
>
>>    The dark blue glow that seems to be right at the glass
>>> is caused by x-rays from the tube.  Its commonly seen in
>>> tubes like audio output tubes with fairly high voltage on
>>> the plates. Some older tubes had a black coating on the
>>> inside of the glass to stop it.
>>>
>>
>> That's my big question and point.
>> You are of course correct about the blue glow,
>> but why is this one happening in a cut-off tube
>> with no current flow, then disappearing when current is flowing?  That's
>> opposite of what
>> I've seen before.
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