Ihave on older line 6 spider iii 75 watt. I had to take the head out to change a cable in it. While I have it apart it's got me real curious as to what all the parts are and what they do? Can anyone tell what the power amp section is and what the preamp section is and the digital effects section is? I just wanna know now that I have it all apart, it's really got me intrigued. It's got a big ole transformer way on the left side with 75 stamped on it? Is that the power amp>? Hence it's a 75 watt amp? Don't worry I know better than to prod around with any of the stuff cause I don't do electrocution too well. Thanks to everyone.