Hi AK; Heard the Korneff 45 a while ago and posted on the PI forumn. As I recall there was quite a bit of discussion concerning that amp at the time so you might want to check the archives. It worked very well with Altec's of exceptional efficiency. They seem to be going for reasonable prices now and I assume that is due to their ultra-low power output. I personally would be interested in your opinion of the amp and if at all possible the design and implementation of the circuit. May I ask is this purchase a result of your ongoing experiments with single driver systems? The 45 seemed to me at the time to be very sensitive to which speakers were used. Even amongst the more efficient speaks there was an obvious connection when they agreed with each other.(I mean the amp and speaks!)