[AMPS] Vacuum Level in tubes

Rich Measures measures@vc.net
Fri, 12 Dec 97 08:35:59 -0800


>Just how good is the vacuum in the tubes?  

For ham sized tubes, anything over 10uA at 2x the rated anode voltage 
would give me worry. 

>Are ceramic tubes at the same
>vacuum level as the glass envelope tubes?
>
they seem to be pretty much the same.   For ceramic tubes, it's not a bad 
idea to test with both polarities.  If the leakage decreases with neg. 
polarity, the leakage is not due to oxygen and nitrogen.  
Rich...

R. L. Measures, 805-386-3734, AG6K   


--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm