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

[Pete Lancashire]

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%201941_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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