It seems that Krell KAV-300i was not an extremely succesful design, bearing a little in common with prior classic Krells.
While both Densen and Accuphase ARE great amplifiers, they are both too old. Their age now is such that problems can be expected in near future, and repairing them would be too expensive and too difficult, especially here where I live.
While the 14-years old Electrocompaniet is by far the best choice among these 4 used amps, a new JOB would be even better choice.
If you agree or disagree, you're welcome to comment if you feel like it. Especially if you're familiar with JOB AND Electrocompaniet .
Thank you all for reading and contributing to this little thread.