Transistor power dissipation

Hi guys,
I tried reading about this but i got myself mixed up.
Am rebuilding an old amp too far into the project i cant back down.
The transformer is a 200va 35Vac,that comes to +/-50dc.Two pairs of A1943&C5200 output devices.I intend to use it on 4ohm load.What would be the power dissipation per device?
Just for more information,i'll need about 100W off the amp.Any changes i should make in this project?Any suggestion will be most welcomed.
Regards,Xeclipse.