[time-nuts] Heated crystal? & Rb tube corrosion (FE-5680A)

Azelio Boriani azelio.boriani at screen.it
Thu Dec 1 17:04:19 EST 2011


The LPFRS has 2 heating elements on both tube ends and a crystal "glued" on
the tube.

On Thu, Dec 1, 2011 at 9:46 PM, Steve . <iteration69 at gmail.com> wrote:

> Are there any other (mosfet)heaters on the oven cavity? Seems that heating
> from one point is going to create a large temperature gradient which would
> probably effect spatial phase congruency. I believe this problem exists on
> the two mosfet configuration as well. Anyway, my idea is to remove the
> mosfet heaters, wrap my own heater using light gauge nichrome  (aka, fuse
> wire), mica insulator and build a proper heater/oven assembly. Finally, pot
> it all together with some sauereisen ceramic cement.  Nice, clean,
> controlled gradient.
>
> Maybe I'm over thinking the whole thing too. I guess I'll find out when I
> start my experimenting.
>
> Steve
>
> On Thu, Dec 1, 2011 at 9:52 AM, Arthur Dent <golgarfrincham at yahoo.com
> >wrote:
>
> > The referenced photos are poor quality and taken in tungsten lighting
> > so you really can't see much from them. Here is a photo I just took of
> > a somewhat similar 5650A that may be new so it is still pretty shiny.
> >
> > http://farm8.staticflickr.com/7142/6436441767_26980890bb_b.jpg
> >
> >  -Arthur
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