[Hallicrafters] (no subject)

[Charlie T, K3ICH]

The RCA 40673 dual gate MOSFET transistor was used as a low noise VHF front
end and mixer.  It's big advantage is that it had self contained protective
diodes so that it could be handled relatively safely, unlike the typical
MOSFETs of the day that, due to their very high gate input impedances,  were
extremely sensitive to static damage.   They were relatively inexpensive and
offered some of the best (low) noise figures for VHF use.  I'm not sure how
high they'd go as I've only seen them used up to about 220 MHz.

Typical GaAsFETs of today, are cheaper and offer even better VHF/UHF
performance, although, they must be handled carefully. This resulted in the
40673 falling out of favor and therefore out of production.

73, Charlie k3ICH

----- Original Message ----- 
From: "Raymond Cote" <bluegrassdakine at hotmail.com>
To: "Boatanchors at mailman.qth.net" <boatanchors at mailman.qth.net>; 
<boatanchors at theporch.com>; "milsurplus" <milsurplus at mailman.qth.net>; 
"Hallicrafters" <hallicrafters at mailman.qth.net>
Sent: Thursday, September 13, 2012 9:25 PM
Subject: [Hallicrafters] (no subject)


>
> Does anyone here know the use that the FET 40673 was so popularly used 
> fur?  In what capacity was it used?  A preamp maybe?
> I have found a few and searching Mouser and Digikey did not yield any 
> source. They say they were discontinued long ago.
>
> Anyone?
> Anyone need one?
>
>
>
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