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From: elkind@nodename.dec.com (Steven A. Elkind)
Newsgroups: sci.electronics,rec.ham-radio
Subject: Re: Has anyone made any homemade valves (tubes), semiconductors ...
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Date: 26 Jul 90 17:24:36 GMT
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In article <872@massey.ac.nz>, GMoretti@massey.ac.nz (Giovanni Moretti)
writes... 
>Peridically I get the feeling that radio ... is getting far too hard
>to do - you need 99%+ pure Ge/Si ... and huge factories and $00000000.
>

What about alloy junction germanium transistors - they should be doable in
non-cleanroom circumstances, shouldn't they?  I'd imagine the materials
wouldn't be too hard to obtain, and the geometries are large enough that real
clean room conditions wouldn't be all that necessary.  The yield might be
somewhat low, and the device parameters scattered all over the place with
home-lab conditions, but I'd think you could get some usable devices with a
modest amount of effort.