[time-nuts] Have done some more cutting on the Cs beam tube
kb8tq at n1k.org
Sun Feb 19 16:19:59 EST 2017
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 …
> 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:
>> 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
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