During discussions on a number of threads, it seems some folks did not take too kindly to what they perceived as a critical assessment of the Harmon Kardon Citation II. While I love the sound of the Citation II, I decided to change the unit over from a pentode to triode input. I caught some flak for this, so I wold like to get this subject out on the table for discussion. First, I refer the reader to this thread, which discusses the citation II: http://www.audiocircle.com/circles/index.php?topic=49209.0 Second, I refer to this topic on distortion: http://www.spectrum.ieee.org/print/1640 So, one can see that while the Citation II enjoys a fine reputation, there is an argument to be made that the amp can be redone to improve performance. What I did to mine is take out the 12BY7 pentode front end, and insert a pair of 5687s per side. I'm looking around to post the schematic (I have not been able to find it, but I will). To get an idea of the topology, google the MFA 120 amp (which uses HK citation II output iron), and a 5687 front end. The thread and article are sourced from well respected audio engineers, so keep that in mind when commenting.