6 4cx1500B
INTERHODULATION DISTORTION - The Radio Frequency Linear
Amplifier operating conditions including the distortion data are
the results of actual operation in a neutralized grid-driven
amplifier. Plots of IM distortion versus power output under
two-tone conditions, as a function of zero-signal plate current,
are included to illustrate the effect of this parameter upon
distortion. Because the 4CX15003 has very low grid interception,
it is possible to drive the grid positive without any adverse
effects upon the distortion level or upon the driver. Class Abz
linear amplifier operation is therefore possible and recommended.
It is also recommended that a low impedance driver be used and
that the input of the 4cx15003 be swamped with a 1000 ohm resistor
from grid to cathode so as to provide an almost constant load to
the driver.
CONTROL-GRID OPERATION - The control gird dissipation rating of
the 4CX1500B is 1 Watt. The design features which make the
4CX1500 such an extremely linear tube also contribute to very low
grid interception. It will be found that the grid will be driven
into the positive grid region in the typical operation of the
tube. The grid current will usually be less than 1.0 milliampere.
Then the 4CX1000 had this additional tid bit
GRID OPERATION - The grid dissipation rating of the 4CXlOOOA is
zero Watts. The design features which make the tube capable of
maximum power operation without driving the grid into the positive
region also make it necessary to avoid positive-grid operation.
Although the average grid-current rating is zero, peak grid
currents of less than five-milliamperes as read on a
five-milliampere meter may' be permitted to flow for peak-signal
monitoring purposes.
Hank K7HP
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