[time-nuts] Loran, GPS, Lightning, Timing

[paul swed]

I have never seen an article using exotic special tubes. I understand that
benefit but common tubes do a fine job. I still believe it was a QST
article. Maybe 73 magazine. It was a long time ago. When I started using
the 12AU7s again for the vlf pre-amp they were $1 or so 7 years ago. Now
audiophiles have driven them into the silly range especially on the
websites. I scrounged 4 at really good prices $2 recently. But the
audiophiles were on the hunt as I noticed.
Bottom line a tube frontend is easy to build for this application. Even if
we want to make it seem hard. Its simply not the front end. Its the other
parts of the solution that should be the focus. How to make a sub $$
solution. The European solution is several hundred Euros. $$$$
Regards
Paul
WB8TSL


On Thu, Jun 26, 2014 at 10:50 PM, Brian Lloyd <brian at lloyd.com> wrote:

> On Thu, Jun 26, 2014 at 9:08 PM, DaveH <info at blackmountainforge.com>
> wrote:
>
> > 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
> >
>
> When I was a kid this may have been my favorite book. I did build the MRS
> when I was 12. Sucker actually worked too! I was amazed. I have built
> several things from this and used many of the projects with modern
> electronics as projects for my students in middle school.
>
> --
> Brian Lloyd
> Lloyd Aviation
> 706 Flightline Drive
> Spring Branch, TX 78070
> brian at lloyd.com
> +1.916.877.5067
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