[time-nuts] Bourns for fine frequency tuning

[Matthias Welwarsky]

On Dienstag, 12. Mai 2020 11:24:39 CEST Matthias Welwarsky wrote:
> 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]
>

Sorry for the broken link, but just search Mouser for "3700S-1-104L" and it 
will show up. Unfortunately, it's a "non-stock" item, but maybe you can get a 
sample directly from Bourns?

> 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
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