The thread is a sad commentary of not knowing anything about dynamic requirements.
Let me try to help.
First you need to know the max 'rated' output of the amplifier.
Next, the drive requirement is different on AM and SSB.
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Example for AM.
If the amplifier is rated at 100 watts max/25 watts in., the most drive that can be applied is 6 watts to be safe and undistorted.
The concern is will the amplifier handle the power dissapation of a carrier plus modulation at full output because it may not cool very well.
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How is this arrived at?
Driver radio----- 6 watts X 4 = 24 watts peak power in AM at 100% modulation.
24 watts would be the peak drive level for the amplifier at 100 watts out.
If you drive harder than this, splatter results and possible damage to the amplifier.
Reason is the amplifier can go into flat topping and gain compression and is 'no longer' linear in output vs input because it cannot make any more clean power.
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Example for SSB.
The driving radio should not go above 24 watts 'peak' power out on voice peaks to keep the amplifier within it's linear operating mode.
Remember the amp only requires 25 for peak output.
The amplifier should be biased for idle current with no drive, to be proper for SSB.
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Letting thing rip is not a way to go about any of this.
Knowing what your doing is.
You have too know the limits of the amplifier, the limits of the driver and some metering to see what's going on or your just running wild, cause interference and damage equipment needlessly.
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Power mikes have no place in a good station.
Very few Amateur stations use a power mike on any modern radio.
If the Mike is matched to the radio input impedance and it's output is normal, the radio audio stages should have enough gain for full output.
Low SWR below about 2 to 1 between the radio and amplifier and amplifier and antenna should be the goal to keep RF out of the radio's Mike circuit causng feedback distortion.
Power mikes only make it worse for feedback.
The goal should be clean audio not the loudest obnixious dirty signal you can put out.
This is about as simple as it can all be explained.
Good luck.