400W Powered Amp for small signal input

[david.sh]

pa_schematics/400mos.gif

Hello ,

I'd like to build a 400W powered amplifier for small signal input from a microphone source to amplify vocals out of PA speakers. I have found the following schematic and I have two questions for whomever is willing to help:

1) Is this circuit adequate for the application?
2) What type of power source should I be looking for (current output) for the +70V and -70V connections?

view schematic :
http://www.geocities.com/pa_schematics/400MOS.gif

Thank you so much for your help.

DAVID

 

[4f4hao]

a 100V Center tap (50V 0 50V), 8A or better transformer wired as a split type bridge power supply should be more than adequate for stereo applications.