Sound Reinforcement amplifier design

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Hi, I'm new to this forum (1st post) and have already done a lot of searching here, but this is taking a heck of a lot of time! I'm looking for a nice solid state circuit to form the basis of a modular amplifier system for PA use around 400W/ch into 8 ohms. I've seen quite a few schematics already on this site, but thought their may be someone here who has a successful circuit in use that I might not have seen yet. Can be FET or bipolar, stability and reliability under difficult loads is an important parameter.

Thanks in advance.
Tim.
 
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