FETs come in to basic types, junction and MOS. Junction FETs can only be depletion types but MOS can be both, depletion or enhancement. CMOS uses enhancement types. The CuO was a depletion type junction FET. MOS is about as different from a junction FET as a junction FET is from a bipolar transistor. All three use semiconductors but in different ways. Connecting the three types and saying it was invented in the 1920's is silly. The MOS FET is only in name related to the CuO FET. They were both field effect. They didn't have anywhere near the manufacturing abilities to make MOS FETs at that time, nor did they understand how it worked to make one. Dwight
________________________________ From: cctalk <cctalk-boun...@classiccmp.org> on behalf of Paul Koning via cctalk <cctalk@classiccmp.org> Sent: Thursday, November 14, 2019 6:22 AM To: Guy Dunphy <gu...@optusnet.com.au>; General Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org> Subject: Re: ge first transistors > On Nov 14, 2019, at 6:49 AM, Guy Dunphy via cctalk <cctalk@classiccmp.org> > wrote: > > At 10:09 AM 14/11/2019 +0000, ED SHARPE wrote: >> >> g11 for analog and g11a for digital and pulse >> we have a G11A new in box unused with cellophane surround available >> respond off list > > > Pretty cool. Some pics down a way in this page: > > https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/general-electric-history Neat. Speaking of old semiconductor history, I'd love to see again the description (data sheet or magazine article, I'm no longer sure) that my father had, about FETs made from copper oxide. Possibly before the 1940s, I don't remember. I've had no luck tracking any of this down. paul
