For years now, I’ve loved tube guitar amps. (I’ve owned 2.) When it comes to choosing an amp, I always just played though the amp at the music store to see if I liked it’s tone, and researched the amp online. I’ve always heard people talk about their, “Class A” amplifier, or their “Class AB” amplifier but never knew what it meaned. Understanding the different amp classes can come in handy when looking for an amp that fits your tonal, power, or durablity requirements. Thanks to the following webpage Google was good enough to find for me, I now know what the different classes are.
http://www.sweetwater.com/shop/guitars/guitar-amps/buying-guide.php#3a