Will wrote:
<It's impossible to run one temperature on zirconium.
I guess Eimac is lucky they quit making 3-500Z's, since the
gray power on the anode is the getter and it is zirconium.
>By the way, Terman on page 187 of my Third edition warns
>about excessive resistance in grid leads. Terman states, "
>If the resistance in the grid circuit is high enough, this
>process can become cumulative, resulting in the control
>grid
>potential suddenly becoming positive and causing the
>**destruction** of the tube as a result of excessive plate
>current."
Will wrote:
<<Nowhere in the whole paragraph about gassy tubes (Effect
of Gas upon Tube Characteristics) which is under part 13,
page 316 in this book, says a grid became positive! It only
says this can cause a grid to become "less negative"!>>
The text of the page in the third editon of Terman is at
the bottom of:
http://www.w8ji.com/fusing_and_floating_grids.htm
Anyone who wants can look and see what it says for
themselves.
73 Tom
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