Hi friends,
Recently I purchased a famed Class A amp, namely Krell KSA 50 to run bass of 4343 in bi-amp mode. The other day I brought Krell KSA 50 back home after having had it checked and fixed by an experienced tech nearby. He said he diagnosed it and repaired a couple of parts including a small 'lytic cap'. He said he "adjusted bias, along with load and audio test". Currently it's running bass in a bi-amp mode for my JBL 4343 system, producing a much more dynamic and deeper rich bass and larger sound stage than before. Now this is my question: as I understand, this Class A amp is supposed to run hot and that VERY HOT. But after several hours of running, it still is running cool, not even lukewarm around the unit cover when I touch it. I checked the fan-cooler inside, and it's running all right while it's on. Is this running cool normal? If it's so, is it because of bias adjusting rather low or high done by the tech? I appreciate any comment or feedback from you who had a similar experience in advance.