[time-nuts] Restoring GR 1120-AB Frequency Standard - Need assist...
WB6BNQ
wb6bnq at cox.net
Tue Aug 19 17:49:22 UTC 2008
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 pictorial
short-form PDF catalog that gives a clear picture of their temperature
switches. Here is the URL for that :
[2]http://www.tempco.com/Intro2008small.pdf See the 31st page.
No doubt there are other manufacturers but this is the only one that
comes to mind at the moment. As for #1 or #2 questions, I would think
of those as a last ditch effort.
Bill....WB6BNQ
wa3frp at aol.com wrote:
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 Princo
and is no longer available.
My options appear to be:
1. locate a working GR Standard Frequency Oscillator (1113-A) and
replace the entire chassis.
2. locate a non-working GR Frequency Oscillator and part it out as
needed
3. find a suitable replacement for the original thermoswitch (78 C -
closes circuit when temperature is reached)
I was wondering if anyone on this list has any sources or leads for
#1
and #2 and any opinions on a source for #3.
Thanks
Russ WA3FRP
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References
1. http://www.tempco.com/
2. http://www.tempco.com/Intro2008small.pdf
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