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From: Sven Hegewisch
Subject: Re: Home brew linear accelerator?
Date: Mon, 23 Sep 2002 09:52:03 +0200
Organization: [posted via] Leibniz-Rechenzentrum, Muenchen (Germany)
References: <3D8B60B3.1090107@BOGUS.earthlink.net> <3D8C1E99.74B9964D@earthlink.net> <3D8DC36E.516C8809@webaccess.net>
NNTP-Posting-Date: 23 Sep 2002 07:51:39 GMT
X-Mailer: Mozilla 4.7 [de] (WinNT; I)
Chuck Simmons schrieb:
> The glass hardly leaks at all. Vacuum tubes made 70 years ago still
> work. The leaks were due to the epoxy. A good example of this problem is
> laser tubes. The original epoxy seal tubes had a life of a couple of
> years whether they were used or not. The hard seal tubes can last for
> many years. I have some hard seal laser tubes nearly twenty years old
> that still work.
One point to mention is that vacuum tubes have internal pumps - the getter.
Even if the glass leaks, the vacuum is maintained until the getter is
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