The tube was probably the FP-54 http://frank.pocnet.net/sheets/141/f/FP54.pdf
No luck on finding the article - it is not in the Handbook of Projects for the Amateur Scientist by C.L. Stong http://www.sciencemadness.org/library/books/projects_for_the_amateur_scienti st.pdf I thought it might be as I remember there was a project to detect sferics but this one used plain 12AU7s and 6AU6s > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Poul-Henning Kamp > Sent: Wednesday, June 25, 2014 13:45 > To: Discussion of precise time and frequency measurement; Didier Juges > Subject: Re: [time-nuts] Loran, GPS, Lightning, Timing > > In message > <[email protected]>, Didier Jug > es writes: > > >I think it would be perfectly appropriate to design an LF amplifier > >with 12AU7s considering the high signal levels when the storm does > >get close. > > Somewhere, sometime, I saw an homebrew article for a > lightning detector > which was based on some obscure valve/tube that had grid on the top > terminal. > > A wire from the grid electrode ran to a porcelain isolator and from > there to the wire antenna, in order to get the highest possible > imput impedance. > > I have no idea where I saw that article, but some HAM magazine or > possibly Elector about 10-20 years back is a good guess. > > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > [email protected] | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by > incompetence. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
