>>283830>>283828Skipping to the topright:
Plate - This tunes the plate circuit of the primary amplifier.
Load - This tunes the output circuit of the pi network to match your antenna / feed impedance.
When adjusting, you should set the controls to a preliminary adjustment to whatever frequency you are operating on, then work from there. The figures are published in the manual, as well as around the dial.
CARRIER should be set almost minimum (This is from the days of AM... a blank "carrier" signal has your voice on top of it. However, you are transmitting carrier-only when adjusting the transceiver. The carrier is set low, so you have a low wattage output, thus creating less heat and less potential for damage), then the plate current needs to be dipped. Key the transceiver, causing it to transmit a signal. Then, you tweak the PLATE knob until you notice a dip in milliamps. If PLATE milliamps exceeds .100, the CARRIER must be reduced or damage can result.
LOAD should be set for whatever frequency you're on. This is usually between 3 and 5.