[time-nuts] Have done some more cutting on the Cs beam tube

[paul swed]

Exactly the higher temp boils off more Cs to raise the signal to noise at
the expense of tube life. Thats exactly how I run Frankenstein. Though in
that case I am eking out what was left at no expense to tube life because
it was dead.
We are talking C fumes.
Regards
Paul
WB8TSL

On Sun, Feb 19, 2017 at 4:19 PM, Bob Camp <kb8tq at n1k.org> wrote:

> Hi
>
> The high performance tube runs at a higher beam current than the standard
> tube. One would guess that a bit more Cs boils off to supply the beam
> at the higher temperature. There are rumors that the high performance tubes
> were “selected” out of the batch. Even if that was once true, who knows
> if it’s true today …
>
> Bob
>
> > On Feb 19, 2017, at 3:04 PM, Bill Dailey <docdailey at gmail.com> wrote:
> >
> > Is it possible that the higher temp keeps the tube "cooked off?"
> >
> > Bill Dailey
> >
> >
> >> On Feb 19, 2017, at 12:54 PM, <cdelect at juno.com> <cdelect at juno.com>
> wrote:
> >>
> >> Hi,
> >>
> >> The tiny coil inside the beam path is the low frequency coil used for DC
> >> testing of the tube.
> >>
> >> The tube shown is a standard performance tube and has no degaussing
> coil.
> >>
> >> The flat windings on top of the shield are the C-field winding.
> >>
> >> The high performance cavity is even "prettier".
> >>
> >> You can see one at http://www.leapsecond.com/pages/cesium-tube/
> >>
> >> Towards the bottom you can see the C-field windings in slots around the
> >> circumference of the cavity.
> >>
> >> BTW in 5071A tubes there is no internal difference between the STD and
> >> High Performance tubes.
> >>
> >> They just run at different temperatures! Saves having to build two
> >> different tubes!
> >>
> >> Some more interesting 5071A tube info will post in a couple weeks!!!
> >>
> >> (Hint: Run your 5071A HiPerf tube at the Std tube temperature to extend
> >> life!!!???)
> >>
> >> Cheers,
> >>
> >> Corby
> >>
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