Here is the link to some fine pictures and the schematic. Its uasable.
http://worldpowersystems.com/J/instruments/GR723/
As a heads up the AC power comes in and is immediately doubled.
Loaded something like 164 VDC.
Reg tubes 107 V.
Osc draws 35 Ma at 135V B+.
Fil 1.42V@47 ma.
Distortions quite
Well we are kicking butt on 723 oscillators. I have the 1000 hz model and
found it at the MIT flea about June.
Bad rectifier section. Cap was good though I carefully reformed it. Have to
say what attracted me was the case and then the realization of what it was.
It works very well so now I can
Another fascinating tuning-fork standard was used together with a Synchronome
to govern the timing of pulses of Morse code on undersea telegraph cables in
the British empire’s globe-girdling telegraph network. Timing was derived
electromagnetically from incoming Morse code signals (a bi-polar
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-
>
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
