Phil's a bit of a **** isn't he? Anyway, yes, SE is the big 91 flaw but it could be improved with NFB off the secondary or via a tertiary. The 91 has NFB but the opt is not in the loop. -- Message posted using http://www.talkaboutaudio.com/group/rec.audio.tubes/ More information at http://www.talkaboutaudio.com/faq.html