[ARC5] Solid State Tubes

[J. Forster]

http://www.slack.com/misc/Fetron.pdf

-John

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> In my first job after college, at Tinker AFB, I had a bit of an encounter
> with production solid state tubes, called "Fetrons."  Someone suggested
> that we replace some tubes with Fetrons.  The ones suggested for
> replacement were 12AT7's and 12AU7's and the like, in a temperature
> controller that drove a bleed air valve in the B-52D.  I discussed the
> application with the company and they confirmed that Fetrons were not
> universal replacements for tubes but had to be engineered for the specific
> circuit application.  I guess that the fact is that vacuum tubes are
> physically more fragile than solid state devices but are electrically more
> rugged.
>
> Also, while I cannot find my copy of the article, I found a note that the
> April 1977 issue of QST magazine had an article on building solid state
> replacements for tubes using FETS and MOSFETS.  I built one or two of
> these and installed them in my National NC-155; they worked but for some
> reason knocked out the S meter function.
>
> And I found in my notes that the August 1962 issue of QST has an article
> on building a very simple 12 VDC  to 110V 60W AC inverter; it uses only a
> 110/24 VCT transformer, two PNP power transistors and 4 power resistors.
> I built one and it  worked fine the first time I fired it up, which
> impressed me a great deal.
>
> Wayne
> WB5WSV
>
>
>
>
>
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