Thank you, Pete. -Don ==========================
On Sat, 2017-12-09 at 05:57 -0800, Pete Lancashire wrote: > Here's a look at a 723-C (1,000 cps) and how its power supply cap was > handled and a good look inside > > https://www.eevblog.com/forum/reviews/vintage-teardown-general-radio- > 723-c-vacuum-tube-tuning-fork/ > > > The GR Experimenter > > http://www.americanradiohistory.com/Archive-General-Radio/GR%20Exp%20 > 1941_10.pdf > > There is another Experimenter that goes into how the tuningfork was > made > but can't find it > > -pete > > On Sat, Dec 9, 2017 at 5:18 AM, Don <dlewis6...@austin.rr.com> wrote: > > > > > > > > > I was fortunate to find a vintage, General Radio (GR) Model 723D > > > Precision Oscillator (tuning fork). > > > > > > The exceptional wooden case is as 'exciting' to look at as is the > > > mechanical tuning fork inside (400Hz). > > > > > > As it is ac powered, I'll need to recap it before I turn it on. > > > Then, we can test for accuracy! (sic). > > > > > > A real class-act, 'time-nut' oscillator from the last century, > > > predating crystals. > > > > > > Don > > > > > > Don Lewis > > > Austin, TX > > > N5CID > > > > > > > > > > > > > > _______________________________________________ > > 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/t > ime-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.