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Path: utzoo!linus!decvax!harpo!floyd!vax135!ariel!hou5f!hou5g!hou5h!eagle!allegra!alice!rabbit!jj
From: jj@rabbit.UUCP
Newsgroups: bell.ham-radio,net.ham-radio,btl.ham-radio
Subject: Re: HELP? - Solid State Tubes
Message-ID: <2055@rabbit.UUCP>
Date: Wed, 12-Oct-83 14:15:43 EDT
Article-I.D.: rabbit.2055
Posted: Wed Oct 12 14:15:43 1983
Date-Received: Thu, 13-Oct-83 22:10:44 EDT
References: <437@ihps3.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 24


I suggest that you look through the Supertex and Ferranti
Power FET lines.  You might also consider combinations of
a Depletion(naturally0 JFET and an Enhancement V-FET
for tube replacements.    I don't know of any useful
depletion mode Power FET's, partly because the mechanism that
most of the Power FETS use is easier done in enhancement
mode.  With a few circuit componenets, though, making 
single device replacements for many low frequency tubes
isn't impossible.

I recently hacked up a couple of power fet's into an
old tube (audio) amplifier for the heck of it.  There
weren't any real complications other than the fact that
I had to make the bias supply positive rather than negative.

If anyone out there has more info on these tube replacements,
let's hear it! I'm interested for other than tube replacement
reasons. <sigh>
-- 
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   ~              rabbit!jj
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