[AMRadio] Too much HV

[David Knepper]

I have been told that if there is "flashover" in mercury vapor tubes, that 
tube(s) should be replaced.

Comment.

David Knepper, W3CRA/W3ST
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----- Original Message ----- 
From: "Rob Atkinson" <ranchorobbo at gmail.com>
To: "Discussion of AM Radio in the Amateur Service" 
<amradio at mailman.qth.net>
Sent: Wednesday, November 16, 2011 6:24 AM
Subject: Re: [AMRadio] Too much HV


> The older MVs have _a lot_ of mercury in them compared to the ones
> made near the end of production.  I have 866As from the late 60s and
> you can't even see the mercury in them but it's in there because the
> tube clouds when you heat it up.  But the earlier RCAs look like they
> have 10 times more mercury.  That may make them more likely to give a
> light show.
>
> This is very important:  MVs _must_ be kept vertical.  If you move a
> p.s. deck and turn it on its side with them in there or pull them and
> bounce them around then you have to let them sit vertical for a long
> time afterwards to make sure the mercury has settled back down in the
> bottom of the glass.  Even if you let the filament heat up, if they
> were recently turned upside down, you may have a problem.
>
> 73
>
> Rob
> K5UJ
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