The same thermostat was used in the GR 1113-A which I have one of. That may lead you to another source for a replacement.
Regards. Max. K 4 O D S. Email: [EMAIL PROTECTED] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [EMAIL PROTECTED] ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <time-nuts@febo.com> Cc: <[EMAIL PROTECTED]> Sent: Tuesday, August 19, 2008 4:55 PM Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard - Need > Sorry for missing enough detail on the original thermoswitch. > > The original thermoswitch was a unique design that I have not seen > elsewhere. The Princo thermoswitch was a modified mercury thermometer > with two electrodes installed. When the temperature rises, the column > of mercury comes into contact with both electrodes and completes the > electric circuit. The inner oven stays within +/-0.05 degree C of 78C. > > Since the design involved a mercury thermometer, the form factor is > 0.25 by 4.25 inches. > > > > > -----Original Message----- > From: Mark Sims <[EMAIL PROTECTED]> > To: time-nuts@febo.com > Sent: Tue, 19 Aug 2008 1:54 pm > Subject: [time-nuts] Restoring GR 1120-AB Frequency Standard - Need > > > > The original thermoswitch sounds like is is a mechanical switch, so it > can't be > all that accurate or stable. > > I would use something like one of those TO-92 temperature sensor chips. > I would > probably use a 8 pin micro with an A/D to read it and drive a reed > relay (or > transistor). Analog people would use a comparator and voltage > reference > chip/pot. > ---------------------------------------- > > _________________________________________________________________ > See what people are saying about Windows Live. Check out featured > posts. > http://www.windowslive.com/connect?ocid=TXT_TAGLM_WL_connect2_082008 > _______________________________________________ > 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. > > _______________________________________________ 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.
