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Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work

To: R L Measures <r@somis.org>, g3rzp@g3rzp.wanadoo.co.uk
Subject: Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Mon, 24 Jul 2006 07:40:09 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Rich said:
>I autopsy tubes, and I have no yet seen an arc mark in a kaput tube  
with a good vacuum.<
It's sad that G6JP is no longer alive. He spent his entire working life doing 
tube manufacture and applications at the M-O valve company, and he said that 
flashovers weren't uncommon. There's also the articles in the Journal of the 
IEE. My father in law tells me that they had flashovers in continously pumped 
tubes at the QRO point to point stations he worked at -although the biggest 
problem was when someone with greasy fingers touched the grid during 
re-assembly. That meant that they had a lot of pumping to do before the valve 
really got hard.
So Mr. Measures, the fact you've never seen what you take to be marks of a 
flashover in a  tube with good vacuum doesn't mean that it doesn't occur. But, 
of course, proving (or disproving) a negative is not easy, so either party can 
sit back in the warm glow of satisfaction that really, they're the ones who are 
right!
73
Peter G3RZP
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