>
>> 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
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