[time-nuts] Bourns for fine frequency tuning

[Matthias Welwarsky]

Hi,

The Bourns 3700S series is still available, a 100k Ohm part is this:
https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs=
%2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D[1] 

regards,
Matthias

On Dienstag, 12. Mai 2020 11:03:02 CEST timeok at timeok.it wrote:
>    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
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[1] https://www.mouser.de/ProductDetail/Bourns/3700S-1-104L?qs=
%2Fha2pyFadujnek9uGXX64FiPDt0iEW4%2F27z9APd4XbI%3D