On 5/26/2011 10:19 AM, Rob Atkinson wrote:
> I run 3-500zg orange for years with no trouble--you just have to blast
> the air over them;
In my 2K4 they ran quite bright.
> only RF PA tube I know of that isn't supposed to
> show color is the 813
I used to run 813's well past showing color. They were downright
glowing, yet I never had any problems with them. Of course back then
they were $5 to free and "we" as in most hams I knew running them, never
worried about pushing a tube "a little"
73
Roger (K8RI)
> and if you look at the plate thickness you will
> see why. There are probably others not meant to show color, but I
> don't know which ones. I do know the 4x1 isn't one of them. In
> fact, the way to shorten the life of a 4x1 is to run it light with a
> dark anode if you ask me. Also run about 8 v. filament hi hi.
>
> Rob
> K5UJ
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