RF output when just keying the mike

Maurice Bersan
 

Hi everyone looks like I have problem.
I have RF output of about 5w when I key the mike with no modulation input. When I do speak into the mike the modulation is very distorted as heard on a local SDR.
CW seems fine with a nice clean signal.
The problem happened suddenly while trying to tune up with a manual antenna tuner.
I replaced the two irf510 fets but no change. Anyone have any ideas where I can start looking?
Thanks for any help
Maurice
Vk6hly

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