[time-nuts] Restoring GR 1120-AB Frequency Standard - Needassist...
WB6BNQ
wb6bnq at cox.net
Tue Aug 19 18:42:40 UTC 2008
Russ,
Here is another company that has several models of bi-metal TEMPCO type
switches. Including some very small ones in either a dip (6600 series)
or TO-220 style (6700 series).
[1]http://www.airpax.net/site/sensing/bimetal/index.html
To make Mark happy, if you google various combinations including "solid
state" you will see some listings for solid state items but I have not
checked them. I probably would not go overboard in trying to retro-fit
with some solid state overkill because I don't think it will achieve
good enough results. Besides it would not be a proper restoration at
that point.
Bill....WB6BNQ
WB6BNQ wrote:
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][2]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][3]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. [5]http://www.tempco.com/
2. [6]http://www.tempco.com/Intro2008small.pdf
3. [7]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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References
1. http://www.airpax.net/site/sensing/bimetal/index.html
2. http://www.tempco.com/
3. http://www.tempco.com/Intro2008small.pdf
4. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
5. http://www.tempco.com/
6. http://www.tempco.com/Intro2008small.pdf
7. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
8. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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