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From: perley@galaxy (Donald P Perley)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: Has anyone made any homemade valves (tubes), semiconductors ...
Message-ID: <10368@crdgw1.crd.ge.com>
Date: 26 Jul 90 17:04:20 GMT
References: <872@massey.ac.nz> <37291@shemp.CS.UCLA.EDU>
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Reply-To: perley@galaxy (Donald P Perley)
Followup-To: sci.electronics
Organization: GE Corp. R & D, Schenectady, NY 12345
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In-reply-to: cccph@eel.cs.ucla.edu (Charles Hobbs)

In article <37291@shemp.CS.UCLA.EDU>, cccph@eel (Charles Hobbs) writes:
>In article <872@massey.ac.nz> GMoretti@massey.ac.nz (Giovanni Moretti) writes:

>You could do this successfully if you had some way of getting a  
>good vacuum. (Commercial valves have chemical compounds known as
>"getters" which aid in removing oxygen from the valve)

One thing that would help is to light up the tube for a bit with the
vacuum pump still running so any initial outgassing can get sucked 
out.

I'm not sure what is in the getters.. maybe those could be homebrewed
as well?


-don perley
perley@trub.crd.ge.com