This intrigued me as I have an IC706 Mark 1 which was the same model that Wolfgang mentioned. The IC706 had been tucked away in a cupboard for a little while, so I dragged it out and hooked it up to a dummy load and a power meter. To my surprise and delight, on the lowest power setting I discovered I could get around 2W output on 472khz.
However, what didn't quite add up was that I couldn't hear anything on the FT1000MP that was running in the shack- either the MP is a bit deaf - OR the 706 is not doing quite what I think it is! So I will have to look a bit more carefully!
Have a look at DL4YHF's interesting post here