[time-nuts] Glass Envelope Quartz Crystals

[EB4APL]

Here is a picture of one of those British made glass envelope crystals 
with miniature 7 pin bases.  It is marked 62.500 KC/S and came from an 
old Marconi broadcast B/W TV sync generator.
https://www.dropbox.com/s/3jtadg2c9rlc42n/Glass%20crystal.jpg?dl=0

Ignacio, EB4APL


On 03/02/2016 a las 22:41, Ian Stirling wrote:
> On 02/02/2016 03:24 PM, Don Latham wrote:
>> You have it right, iovane. At the least, they should be protected 
>> from light,
>> thermal radiation, and emf.   Won'drous things will happen if the 
>> crystal and
>> its structure are subjected to radiation through the glass. I'd 
>> suggest a foam gator
>> wrap in a tin can as a minimum. Put the oscillator cat in there too.
>
>   I have a 100 kHz glass "Crystal Unit" made by G.E.C., type JCF/193
> with a serial number and sealed in a valve/tube with seven pins.
> I removed it from my Eddystone EA12 that I bought from Tom Roberts,
> G3YTO, SK 1985. It has a black shield with a spring inside at the top
> so that it grips the base. The valve that produced 100 kHz markers for
> dial calibration failed and I don't use the EA12 these days.
> It will be interesting to see how stable it is and what the effect
> of light and heat on it is when I start experimenting.
>
> Ian, G4ICV, AB2GR
> -- 
>
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