What are the advantages to a Class A amp & what are the trade offs?


I've never had a class a amp but am considering one now. So what am I getting myself into?
128x128artemus_5
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“The Krell KSA amps are pure Class A.”
The only Krells that were full Class-A biased into 8ohms were the KSA50 and the KSA100 and KSA100 MkII monoblock, all these were internal chimney heat sinking and fan forced.
https://youtu.be/kqSkh08AmKM?t=1

Cheers George 
George, Krell never made a mono amp with the designation KSA.
they were KMA 100s and there were also KMA 50s and 200s. They all used fan powered chimney heat sinks and they were all class A to rated power. I owned a pair of KMA 100s for 20 years and they were great amps.
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In simple word Fantastic listening pleasure just like going to an Opera house or Jazz bakery club in LA.  During winter its an alternative heater