[time-nuts] General Radio Model 723D Precision Oscillator (Tuning Fork)

Don dlewis6767 at austin.rr.com
Sat Dec 9 10:11:46 EST 2017


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 <dlewis6767 at 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
> > > 
> > > 
> > > 
> > > 
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