that is a little different jim.
he is talking about solid state amps.
putting one together and designing them are different mang.
from what i understand about tubes, there arent much to make them work. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif
I know, I'm busting his balls //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
And to everyone that's talking about efficiency...wusses //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif
Audiobahnuser: No, it won't cost thousands to build a respectable solid state amp like you're imagining, but it is more work than you think. The only way I see you getting that kind of power and having a chance to do it yourself is by stacking Gainclones or other chip-based amps together, I've seen a couple projects that are around 100W per channel based on chip designs, and since it's just an IC instead of discrete components, the circuits are manageable. That way, you use pre-fabbed PCB's, documentation is easy to come by, and most importantly, you have a network of builders that can help you in case you go wrong somewhere.
Go here:
http://www.diyaudio.com and read the solid state section. Many times. Find out what people are talking about, read links...sleep with schematics next to your bed.
Nelson Pass (passdiy.com) has done some great work with JFETs running Class A, but 10-15W won't be enough for in-car use. I hear they're amazing on horns though...