If the feedback was taken from the speaker terminal side of the resistor, the damping factor wouldn't change. If the feedback was taken from the transistor side of the resistor (same as inserting the resistor between the speaker terminals and the speaker), then it would make a difference.
Have you reinstalled the other two capacitors?
Hello
No i just change BUZ103AL with IRFZ46N and the problem apear after that just when i touch the resistor surrounded in red on the photo
i'll put the other two caps
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