General steps of debugging:

1. Connect the system, because your amplifier may be self-excited. Pay attention to the protection of the instrument, and add attenuators to the input and output of the instrument, especially choose the appropriate attenuator according to the power that your attack and amplifier may output between inputs; At the same time, the power supply for supplying power to the gate of mos tube can adjust the voltage, and the power supply for supplying power to the drain is preferably of limited current function; Before welding the power tube, you can adjust the voltage of G electrode to or very small.

2. After welding the power tube, don't power on in a hurry. Be sure to check the system carefully. It is best to use a pointer multimeter to measure the voltage of G electrode. The stylus of the digital meter may have a higher voltage, especially for cmos tubes. Limit the output current of the drain power supply to a relatively small range;

3. Pay attention to the frequency response waveform and power supply current of your instrument after power-on, and gradually increase the gate voltage until it is turned on. If there is no self-excitation phenomenon after power-on, gradually increase the voltage and gradually release the output current of the drain power supply until you design the static operating point voltage;

4. Debugging frequency response. If the power amplifier is matched with discrete components, the size and position of the inductor and capacitor can be appropriately changed, and the patient debugging can be adjusted to your reasonable index requirements; If it is used at higher frequency, it is difficult to debug by using microstrip circuit matching;

5. After debugging the frequency response, it is necessary to debug the linearity index of the power amplifier. Generally speaking, the output matching circuit has a great influence on linearity. You can change the output matching without considering the frequency response to improve the linearity index. After reaching the required index, go back to the fourth step and debug the frequency response, but don't change the output matching circuit at this time.

I think you can meet your requirements by debugging it back and forth several times.