[Boatanchors] Boatanchors Digest, Vol 123, Issue 34

[Raymond Cote]

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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