Many thanks to those who replied to my request for 4CX1000A advice. I now
have the info I needed in regard to the question about filament/heater
chokes. However, the other question I asked remains pretty much unanswered.
The question was:
Many references have been made to grid damage
in the 4CX1000A and similar tubes; what are
the detailed symptoms of said damage? (Assuming
the tube still sorta operates)
The only answer I received (from Rich Measures) was:
>The grid in the 8168/4cx1000A is barely visible to the naked eye.
>Presumably, when the 0w [sic] grid dissipation rating is grossly
>exceeded, the tiny grid wires melt.
Forgive me Rich, but I don't think that answer directly addresses the
question. Perhaps you are just being sarcastic by saying if you get any
grid current the tube is destroyed.
Now, I believe the lack of response may be attributed to one or more of the
1) No one really knows squat about a 4CX1000A.
2) Somebody knows, but he ain't talking.
3) The whole idea of 0 watt grids is B.S. and you can run moderate grid
current forever as in the 4CX1500. (Or at least until the neighboring hams
Larry - W7IUV
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