Re: [time-nuts] Glass Envelope Quartz Crystals
This is a very interesting discussion. I have experimented with some audio frequency crystals in the 3-6 kHz range. I don't know what they came out of but it was probably some sort of FDM telephony or telegraphy equipment. They're in the form of vacuum mounted bars with 4 plated terminals in tall 7 pin or octal tube envelopes. When suitably driven they oscillate audibly like a bell ringing and as a result of the very high Q they even keep ringing for a few seconds after the power is turned off. Unfortunately I don't have access to a stroboscope. I'd like to do something useful with them on display, perhaps a clock for people with presbyacusis who wouldn't notice the sound :-) Morris >> 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. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Glass Envelope Quartz Crystals
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 -- ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. . --- El software de antivirus Avast ha analizado este correo electrónico en busca de virus. https://www.avast.com/antivirus ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
