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Old 2nd March 2013, 10:24 PM   #11
TheGimp is offline TheGimp  United States
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For those with open minds here is the original article.

http://www.vacuumstate.com/fileuploa...lves%20pix.pdf
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Old 2nd March 2013, 10:25 PM   #12
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Therefore as there is less than .0001 torr it is practically non existent. So effectively no gas! Admittedly, there is no such thing as absolute vacuum or zero for that matter.
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Old 2nd March 2013, 10:32 PM   #13
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Quote:
Originally Posted by TheGimp View Post
For those with open minds here is the original article.

http://www.vacuumstate.com/fileuploa...lves%20pix.pdf
Wow, Great post pal. I appreciated it.
Very thanks
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Old 2nd March 2013, 10:34 PM   #14
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Just plug the tube in. When it is operating for a few hours, it will get hot enough for the getter to work well.
Baking tubes is just as stupid as "Cryogenically Treated Tubes".
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Old 2nd March 2013, 10:37 PM   #15
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If you take a look at the link supplied, it clearly states that the absolute vacumm is attained by an explosion within the valve using the getter to spray a Barium compound. Hence the mirrored effect on the inside of the envelope.

This action is a once only action and it caused electrically, without using heat!

http://www.vacuumstate.com/fileuploa...lves%20pix.pdf

Last edited by JonSnell Electronic; 2nd March 2013 at 10:44 PM. Reason: spelling
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Old 2nd March 2013, 10:44 PM   #16
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Quote:
Originally Posted by the_manta View Post
Just plug the tube in. When it is operating for a few hours, it will get hot enough for the getter to work well.
Baking tubes is just as stupid as "Cryogenically Treated Tubes".
Ah, at last someone with common sense!
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Old 2nd March 2013, 10:48 PM   #17
AJT is offline AJT  Philippines
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anyone tried induction heating using coils wrapped around the tube?
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Old 2nd March 2013, 10:51 PM   #18
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We want to believe....on one hand heating up the tubes will reactivate the getters but on the other hand the folks that sell tube collars will pitch keeping tubes cool is more Gooder. So in real life what's the application....tubes in console amps would be less gassy than tubes in guitar amps...why...in console amps the getter is activated because heat rises from the heaters to the getters but in guitar amps the tubes are up side down and the getters are the coolest part of the tubes... So put those gassy tubes either in an console amp or the oven.
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Old 2nd March 2013, 10:54 PM   #19
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Meltdown comes to mind here but an interesting concept.
I think, after over 50 years of valve gear repairing, that there is more than a jot of evidence that running the valves for a minute or so before putting power on the anodes keeps the cathodes in good condition and maximizes the life of the valve. (6L6, EL34, 2A3, KT88 etc). So maybe warming them up first will help.

Last edited by JonSnell Electronic; 2nd March 2013 at 10:57 PM. Reason: Addition
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Old 2nd March 2013, 10:54 PM   #20
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Quote:
Originally Posted by the_manta View Post
Just plug the tube in. When it is operating for a few hours, it will get hot enough for the getter to work well.
Baking tubes is just as stupid as "Cryogenically Treated Tubes".
Old NOS tubes accumulated gas over the years, and since these tubes left the factory in 1980s and came to my door it took a long road with many bumps and drops.

Which may let to the oxide cathode to loose some dust, that may cause a short circuit when receive the HV in usage, so baking the tubes may prevent it.
A tube broker is supposed to do it and charge alot for this service.
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