[AMPS] Filament breakage

[Rich Measures]

>
>> The problem is that the tubes which have the problem typically do not 
>> show signs of abnornal gas.  Out of the 5, kaput 3-500Zs we tested 
>> Monday, none appeared to have a gas problem.  However, all of them had 
>> bent filament helices  If gas was the cause of the problem, where did the 
>> gas vanish to? 
>> Rich---
>
>Very simple, the arc itself can getter the gas. That effect is very 
>well documented in published literature on gettering tubes, arcing is 
>listed as one of the ways a tube is gettered.
I don't believe it.  Arcs tend to make their own gas. ........ 
References?  
>...Most 3-500Z 
>arcs will harmlessly occur between the anode and the large metal 
>shield forming the grid support.
The 5, kaput 3-500Zs I recerntly tested have no arc marks on the grid 
header.  
 You still have not explained how the suppressor resistor increases in R 
during one of these alleged arcs, or explained how the filament helices 
get bent so far they touch the grid cage.  .  
>73, Tom W8JI 
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