Tubes running red on the plate is not a BIG concern. It was
done all the time in commercial service. It is when they
get almost white that you need to worry. A bit of cherry
red is ok. Just remember what KYV said, don't exceed the
plate dissipation of the tubes.
The only other concern is the heat generated. If you run
them hot, then be sure they are force air cooled properly
and the components used in the construction is rated for
CCS.
Jim
W5JO
Jim candela wrote:
On AM the single 813 is happy at 70 watts RF
out, but it will do 100 watts AM and modulate upward
100%. It does blush a
little but as long as I talk the red stays away.
That's about how my SB200 runs. If I run much over 100w,
it gets to red for my comfort. I never stop talking so I
guess I am at it's peak.
This would lead me to conclude that I could get at least
200w out of 2 813's in spite of the numbers. Not a
quantum leap but worth the fun project.
Does that sound right?
js
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