Guillermo,
?
The PR
version of the 4-1000A stands for pulse rated and simply means the internal
structure will handle very high current on a intermittent basis.? Others
may give you a different take on the idle current, but not having a copy of that
handbook I would think that is for 2 tubes.? ZSAC ( zero signal anode
current) for AB1/AB2 is generally adjusted to give about 1/2 of the rated
dissipation of the tube(s).
?
David
KC2JD
?
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A month or so ago, my cousin visited me with an unusual gift. He discovered
an old machine being scrapped and rescued for me (knowing my hobby) two
Eimac
4PR-1000 tubes, with the chassis mount (blower fan included), two
sockets,
clamps and chimneys. You may figure my surprise when I saw him at
my house's
door with such bottles in his hands. The tubes where rescued
from a medical
equipment, so I don't know the performance, although they
look visually good
indeed. I read somewhere these are improved versions of
the 4-1000 types, is
this ok?.
There is a chart for AB2 grounded
cathode work in the ARRL handbook ('97)
which states 3000V plate voltage,
and an idle current of 300mA. This while
idle means you are nearly maximum
rated plate dissipation, is ok?.
Best regards
Guillermo -
LU8EYW.
