One of the tube (valve) companies' last gasps was the nuvistor. http://www.logwell.com/tech/components/nuvistors.html
I still maintain a few well logging tools for customers with nuvistor electronics in em. I also have a magnet charger with a big old ignitron in it that fires the capacitor bank into the coil...it is kind of spooky to use. Syd ----- Original Message ----- To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Tuesday, June 17, 2003 5:49 AM > On Mon, Jun 16, 2003 at 11:29:38AM -0800, Uwe Zimmermann enlightened us > thusly > > it is a switch - even if not of the kind you might be thinking of... > > > > http://www.tubecollector.org/senditron.htm > > > > Uwe. > > There was a curious period in the 1950s when transistors were about and > their potential was becoming evident. The valve companies gambled on > research - and lost. It did spawn a set of valves with ever increasing > numbers of grids and screens. We had a radio from the period without one > triode, tetrode, or pentode in it, but all these curious combinations > and exotic designs. Five years later, the valves were beaten into high > voltage applications. The radio lasted into the 1980s without any > maintainance at all, so they were definitely good for something. > > > -- > > With best Regards, > > > Declan Moriarty. > -- > Author: Declan. Moriarty > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). -- Author: Syd Levine \(AnaLog\) INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
