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General Radio 1190A Quartz Bar

100 kc Quartz Crystal Bar

Several early General Radio high-stability frequency references used a quartz bar resonator inside a thermostatically controlled high-temperature oven. Below are some photos of the amazing GR 1190-A 100 kc quartz bar.

A black aluminum rectangular box about 3 inches long

A first peak at the inside
The suspended gold plated quartz bar in all its glory
Close view of gold wire leads
Other end of gold wire spot welded to slab
View of etched gold bridge
View of nylon thread and spring mounts and non-contact end plates
For scale, a 9V battery with disassembled GR 1190A crystal
1933 patent 2,029,358 describes the "electromechanical vibrator"


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