Damn you Icom. Again, and again, and again. Yes. Alse the IC-9700 is equipped with the famous ‘power overshoot’ or ‘ALC overshoot’ issue most modern Icom transceivers have. Apparently Icom can’t get a grip on this issue. Bad news for people using transistor based amplifiers (SSPA) in SSB mode.
Since the IC-9700 had a ‘TX PWR LIMIT’ function, setting this to 7%* will prevent the amp from going in protection mode. The bad side is that the amp only running about 50% of the effective power.
* In my case I’m using a Gemini 2-500 amp with 4W drive level requirement. If your amp needs 10W input, raising the 7% to [try something like 13%] the value you need. And no. 7% does not mean 7 Watts, thus overloading. The value (percentage) isn’t linear. Measuring the (avg) output will tell you.
Update: Setting the tx-delay to 20 ms solved the issue tripping the SSPA.