If you're just starting with rebuilding/repairing amps, I would suggest you start with some smaller powered amps first.
I have an ultra toasty MA HK4000D if you REALLY want to do lots of rebuilding //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
Im sorta just starting, but a friend that does it ALOT is going to walk me through it to teach me. I just so happen to need a 2500+rms amp at 1 ohm for my personal use so why not pick one of them up and just rebuild it.