[time-nuts] Bourns for fine frequency tuning

[timeok at timeok.it]

   Hi everyone,

   I need your help to find a particular Bourns potentiometer that many frequency standard company use for frequency fine tuning in their oscillators. In my experience, both HP in 107BR and Frequency Electronics in the AN URQ-23 use this potentiometer which has a value of 100k Ohm.

   Unfortunately I can't replace it with other models and by doing some research I found some but at most with a resistance of 10K Ohm. I need two pieces, but if I find more, I would keep them in reserve. The problem with these multiturns is that  the back cover comes off and no longer work. Some can be glued again, others are damaged internally in the cursor because the operator insisted trying to force the spindle.
   In the case of the HP107BR the potentiometer is installed in the external oven and the temperature has accentuated the gluing problem. In this regard, suggestions on which glue can be used for high temperatures are welcome.

   The model is:   Bourns 3700S-196-1004

   thanks,

   Luciano

   Luciano P. S. Paramithiotti
   timeok at timeok.it
   www.timeok.it