Hi: Yes, please make a .PDF File available! Thanks, Ron
-----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of bill Sent: Thursday, July 05, 2012 3:57 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] HP 117/10509a On 7/5/2012 9:49 AM, Randy D. Hunt wrote: > On 7/4/2012 11:09 PM, Charles P. Steinmetz wrote: >> Don wrote: >> >>> the fet breakdown voltage has of course got to be high enough. >> >> If the nuvistor is used as a common-cathode or common-grid amplifier, >> you can cascode the fet with a bipolar to extend its drain voltage >> range. You will need to come up with an appropriate bias source for >> the bipolar. Generally, you would want at least 10-15 volts across >> the FET channel. >> >> Choose an appropriate JFET (transconductance, drain current, and >> gate-drain voltage similar to the nuvistor at the nuvistor's >> operating point). You can add degeneration (source resistance) to >> lower the FET's transconductance if it is higher than the nuvistor's. >> >> Best regards, >> >> Charles >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > I have a PDF document that covers this for Fetrons. This is from > Teledyne. It shows some of the more common tube replacements with the > circuit and actual device number. Let me know if you would like a copy > and I will sent it to you. Or, maybe a better option would be to > upload it to something like Didiers site. . . > > Randy > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. Yes do upload it. I have some Fetrons and want to know what they replace. And in my other life, I ordered some custom Fetrons to replace some WE tubes that was used in WE K carrier. If you don't upload it, send a copy. Bill K7NOM _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.