[Boatanchors] Boatanchors Digest, Vol 123, Issue 34

[J. Forster]

It won't work.

Any x-rays generated inside common tubes are far too low energy to
penetrate the glass.

It takes 10 kV or more to generate anything that even gets out of the
envelope.

http://en.wikipedia.org/wiki/X-ray

-John

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


> Great idea Bob!!!
> Ray
>
> The further a society drifts from the truth, the more it will hate those
> who speak it.
>
> -George Orwell
>
>> On Apr 21, 2014, at 12:13, "rbethman" <rbethman at comcast.net> wrote:
>>
>> See if you can weasel one of those X-ray pieces that they stick in your
>> mouth.
>>
>> Tape it to the side of the tube.
>>
>> You can get it processed at a Walgreens.
>>
>> Bob - N0DGN
>>
>>
>>
>>> On 4/21/2014 12:48 PM, james.liles at comcast.net wrote:
>>> Hi Richard:
>>>
>>> I believe the blue glow on the glass is caused by electrons colliding
>>> with the glass not X-rays.  Don’t believe X-rays will occur before
>>> the elements exceed 30,000 volts at those spacings.
>>>
>>> More than likely a wayward beam element or element positioning error.
>>>
>>> Kindest regards Jim K9AXN
>>>
>>>
>>> Message: 5
>>> Date: Mon, 21 Apr 2014 08:27:38 -0700
>>> From: "Richard Knoppow" <1oldlens1 at ix.netcom.com>
>>> To: "David Stinson" <arc5 at ix.netcom.com>,
>>> <milsurplus at mailman.qth.net>, <boatanchors at mailman.qth.net>
>>> Subject: Re: [Boatanchors] "Blue Glow" mystery.
>>> Message-ID: <2A36AE1D8F9D476183366CCE2B32EB13 at VALUED20606295>
>>> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>>> reply-type=original
>>>
>>>
>>> ----- Original Message -----
>>> From: "David Stinson" <arc5 at ix.netcom.com>
>>> To: <milsurplus at mailman.qth.net>;
>>> <boatanchors at mailman.qth.net>
>>> Sent: Monday, April 21, 2014 7:57 AM
>>> Subject: [Boatanchors] "Blue Glow" mystery.
>>>
>>>
>>>> Here's a mystery for you.
>>>>
>>>> A VT-25 in a Power Amplifier stage.
>>>> Key-up idle.
>>>> Ep = 500V.
>>>> Eg = -110V (cut-off)
>>>> Cathodes at ground.
>>>> No plate current, of course.
>>>>
>>>> Yet.... on the glass envelope is a small blue glow!
>>>> And it disappears at key-down...
>>>>
>>>> Ghosts?  Goblins??
>>>     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.  It does no harm.  I am not
>>> sure why it disappears when the tube is drawing current.  I
>>> think a web search may find an explanation of the physics.
>>>      Note that this is a different kind of glow than is
>>> caused by gas in the tube. That usually takes the form of a
>>> cloud between the elements or throughout the tube and is
>>> usually a lighter color. This is a dark blue and is actually
>>> the glass itself glowing.
>>>
>>> --
>>> Richard Knoppow
>>> Los Angeles
>>> WB6KBL
>>> dickburk at ix.netcom.com
>>>
>>>
>>>
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