[time-nuts] Low frequency crystal

Javier Herrero jherrero at hvsistemas.es
Tue May 20 10:22:27 EDT 2008


I've also saw a quartz for 440Hz in the "gapped ring" format, encased 
like a tube with an octal socket if I'm right. This unit was used to 
generate the line tone in a old central telephone switch. A very nice 
unit to have collected... but the friend of mine that owns it (and 
worked at that central telephone switch years ago) thinks the same and 
refuses to give it to me! :)

Regards,

Javier

Alan Melia escribió:
> Hi Robert in the days before TTL dividers there were quite a few vert low
> frequency cuts. I think that one is a flexural bar designated "NT cut". I
> have also seen crystals of lower than that made in the "gapped ring" format
> which oscillate a little like a tuning fork. ( I think I have seen one of
> these cut for 440Hz, but a 1Khz gapped ring would fit in an Int. Octal GT
> envelope.)

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