These respond to different posts - sorry for any confusion...
I wrote to Devin yesterday - he doesn't share his proprietary heat treat regime, understandably. That's why I am asking here.
Devin Thomas is a pretty credible guy - I can't imagine him lying about the hardness figures he is reaching. If you are not familiar with Devin, do some reading. For his mid-tech AEB-L knife he was originally going to farm out the heat treat but ended up not finding anyone capable enough for his standards, so he still does all his own heat treating.
I have an AEB-L (probably Sandvik 13C26, actually) that was heat treated at Peter's. I want a harder knife - it is a preference after using some very hard Japanese knives. I trust Devin's numbers are true, I am trying to find out how to get there. Does anyone know how?