Still much of a muchness except that the voltage climbed to a dizzy 75 volts at it's peak yesterday. Right now it's back to 72.9 volts which is surprisingly low and the lowest I've seen yet. It's also developed a spike that predominates each switching period. Not sure where that's from. But I'll let it run and report on all this later. There's also a marginal increase in the temperature but I think that relates to an increase in ambient. I'll check this out too.