Indeed, by increasing the input power, it outputs more.

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·???????? 21.200 MHz 40W -> 700 W 470 mA 12.4 dB 2250 V

·???????? 7.100 MHz 40W -> 650 W 450 mA 12.1 dB 2250 V

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We are no longer in a linear range since up to 400 W, the gain is 13 dB.

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Fortunately, your advice helped me; I thank you for it because I'm regaining confidence. My final (operational) objective is 500 W: the power authorized in France.

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PS: There is no ALC connected.