When I was working on military electronics in the 60s, crystals in ovens often had octal sockets. Inside the package there was a mechanical thermal switch on an aluminium casing around the crystal with a heater wrapped around it. Two pins will be the crystal, there may be more than one shield, two pins will run the heater, and you may have a pin from the switched side of the heating element to run the indicator lamp on the front panel. good luck with getting it going, Neville Michie
On 07/03/2008, at 6:55 PM, Bill Bearden wrote: > I have a JK device named a "Thermystal". The > label says "1000 KC" 43 MMFD (any age clues > there?:-)). So I'm guessing it's an ovenized > parallel-resonant crystal which is (was?) on > frequency with 43 pf in parallel. This is a > fairly large unit, about 1.75 X1.25 X 3.25 inches. > It has an ordinary octal plug on the bottom. > > > > Does anyone have any information on this or a > similar unit? I've had no luck with Google. I > especially would like to have the pin connections > and oven voltage, and whether there is anything > other than a crystal and oven in the box. If > worst comes to worst, of course, I'll open it up > and look. > > > > Thanks, > > > > Bill, WB6JVC > > > > _______________________________________________ > 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. _______________________________________________ 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.