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

Is it possible that the higher temp keeps the tube "cooked off?" Bill Dailey > On Feb 19, 2017, at 12:54 PM, <cdelect@juno.com> <cdelect@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 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

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@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@juno.com> <cdelect@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 >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

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@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@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@juno.com> <cdelect@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 > >> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@febo.com > >> To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > >> and follow the instructions there. > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. >