I have a near perfect Krell fpb 600c, i am the original owner purchased from authorized Krell dealer in 2003 (msrp $14,000 aprox.). It has no discolorations on the heat sinks and has never had an issues. I am located in central Ohio and am looking to trade for later model Spectral, Pass or possibly Simaudio W8 or Ayre. I love this amplifier but have not experienced much else in my system (Wilson/MIT/Theta) and figure why not try. I am nervous that i will regret it but i'm going to roll the dice...