[time-nuts] Restoring GR 1120-AB Frequency Standard - Needassist...

[wa3frp at aol.com]

Hi Bill,

The Tempco units look great. My original Google search came up with 
similar Fenwal units that are a bit larger sizewise.  The size of the 
Tempco units appears to be a fit into the space reserved for the 
original thermoswitch.

Thanks for the assist!

73
Russ WA3FRP






-----Original Message-----
From: WB6BNQ <wb6bnq at cox.net>
To: Discussion of precise time and frequency measurement 
<time-nuts at febo.com>
Sent: Tue, 19 Aug 2008 2:06 pm
Subject: Re: [time-nuts] Restoring GR 1120-AB Frequency Standard - 
Needassist...



   Russ,

   Here is the actual catalog PDF page
    
[1]http://www.tempco.com/Catalog/Section%2013-pdf/Surface_Mount_Thermos
   tats.pdf

    Their site sucks for navigation and is very unclear, at first blush, 
on
    how to get to the meat.  But I finally did find it.  The above link 
has
   all the data on the variable model and the one I was thinking of
   (second item) which is the surface mount model.

   Bill....WB6BNQ

   Bill

   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
     _______________________________________________
     time-nuts mailing list -- time-nuts at febo.com
     To unsubscribe, go to
     [8]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
     and follow the instructions there.

References

    1. 
http://www.tempco.com/Catalog/Section%2013-pdf/Surface_Mount_Thermostats.pdf
   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
_______________________________________________
time-nuts mailing list -- time-nuts at febo.com
To unsubscribe, go to 
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.