I have space restrictions at my QTH to install inverted V antennas, etc, so I am using a folded terminated dipole broadband antenna rated for 500 watts PEP on SSB. Before I purchase an Ameritron ALS-600 which produces 600 watts PEP output, is there a way to limit the power output to 500 watts without distorting my signal. That is, am I incorrect in understanding from the ALS-600 online manual that one shouldn't use the ALC Control to limit output because it "pumps" the signal causing distortion on AM (SSB?) transmissions. No such distortion is noted in constant amplitude FM and RTTY modes.
Sidenotes: (1) I considered the ALS-500, which produces 500 watts output, but the 80 amp 13.8VDC requirement is a bit much--plus 12 volt transistors are noisier than 50v transistor systems.
(2) I would consider buying the Elecraft 500 watt linear, but my transceiver cannot be limited to 30-40 watts to drive it. (My transciever will put out only 100 watts or 50 watts.)