The output devices are MJL4281A (NPN) and MJL4302A.
http://sound.westhost.com/project68.htm
The amp has an input for a radio, TV, stereo or other line level device.
http://www.aaroncake.net/circuits/amp50w.htm
250 Watt Audio Amplifier Schematic Diagram.
http://www.freeinfosociety.com/electronics/schemview.php?id=1068
220 Watt Power Audio Amplifier Circuit Diagram and components.
http://www.kolumbus.fi/mikko.esala/superi.pdf
This is an exceptionally well designed amplifier, with a lot of power reserve, high fidelity, low distortion, good S/N ratio, high sensitivity, low consumption and full protection.
http://www.electronics-lab.com/projects/audio/017
The input stage is an LF351 op amp.
http://www.ee.washington.edu/circuit_archive/circuits/km241.html
200 Watt Audio Amplifier Circuit Diagram
http://www.mif.pg.gda.pl/homepages/tom/files/simp200W.gif
Using two TDA 2030
http://www.electronics-lab.com/projects/audio/013
This is an exceptionally well designed amplifier, with a lot of power reserve, high fidelity, low distortion, good S/N ratio, high sensitivity, low consumption and full protection.
http://europa.spaceports.com/~fishbake/amp/ca100.htm