I am in the last stage of restoring a 1964 General Radio Frequency
Standard Model 1120-AB.
I'm having trouble getting the inner oven to work propoerly and the
problem has been traced to a defective thermostat in the inner oven.
In checking, the thermostat is a thermoswitch manufactured by
Hello Russ,
Well, depending upon the size requirement of the thermal switch, I
would consider trying to retro-fit. One company that makes such things
is TEMPCO [ [1]http://www.tempco.com ]. They have several different
kinds and even one model that is adjustable. There is a nice
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
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
