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

It gets hot, eats electricity,less then 40% efficient 
pure class A rarely gets to 100 WPC.

Nobody needs a pure class A amp with 100wpc unless you use it to weld as well. I’ve got a class A 80wpc and it’ll drive any speaker made. It has such a full, lively 3D sound that even non-audiophiles that hear it are amazed. I’m a big fan of class A topology. Don’t think I’ll ever go back to A/B. 

Mickeyb, what is the brand of amp you are using, if you don't mind me asking?

Once I listened to a Class A amp, many years ago, I never wanted to listen to anything else. Some of the older Class A amps used fans which increases your noise floor. The Sumo Gold I ran for a long time used to hit its thermal cutoffs in the summer so you’d lose a channel every once in a while and would have to shut it off until it cooled.

As I mentioned on other threads, I now own a Gryphon Colosseum stereo amp. I think it is one of the most beautiful amps I’ve ever seen and it doesn’t take up a lot of floor space because it is laid out vertically. It has two massive aluminum heat sinks.

What Class A amp are you considering?