Pops, here's what a Class A monoblock looks like, and this one is relatively light and small.

http://www.hometheaterhifi.com/volum...06-part-1.html

Here's a 50wpc Class A amp that weighs in at 90#'s, its all heat sink!

http://www.tnt-audio.com/ampli/amaudio50r_e.html

Here's and interesting article about Class A, and if you scroll down to where it says "Are those Class A amplifiers I see advertised really Class A" you will get your answer.
http://www.aikenamps.com/ClassA.htm