Oistein Klevhus, now at FHI (Public Health Institue) in Norway, and myself, did a project together at the end of our engineering school.  I am greatly in debt to Oistein, because he was the one who made it possible for me to go through with that school. I was far to busy with EC, and had far too little time for school. Oistein came over to me at EC with school work tasks and other stuff I had to do, and in that way it was possible for me to manage doing the school without nearly being present.  I am forever grateful for that!</p>

The amplifier :  It was a very special design, fully complementary, and used matched single field-effect transistors at the input, and some very interesting output transistors, with a very low turnover point. 

I will come back with more info on the matching of the input transistors, but for now - they required manual matching, and it wasn't easy to find a pair that worked. Note also, the very low emitter resistors on the output stage.  This matches a later paper I did on the AES.  More on this later.