I pretty much a novice when it comes to really understanding or testing electronics. I've built some circuits (board etching, soldering, etc) but never designed circuits. I have a basic understanding of electronics, but transistors and their magic smoke always trip me up. I'm basically here to gain some knowledge on testing circuits, especially audio amplifiers. I have some vintage electronics (is '80s really vintage?) that I'd like to resurrect and/or maintain. I still have the receiver and speakers that I bought with my first tax return back in the '80s. A Realistic STA-785 receiver and a pair of Realistic Mach Two speakers that need re-foamed.