My 10m WSPR TX beacon remains on with the PA turned off. According to my TinySA spectrum analyser the power is about 500uW. After several days I have still to be spotted.
UPDATE 1100z: It worked at 50mW and has worked in the past at 500uW, but I think conditions have to be exceptionally good for it to work at this power level, especially with higher RX noise floors these days. I shall probably return to QRO for me tomorrow (500mW!!).