300w power stereo amplifier with pcb layout

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all members explanation appreciated and which class is this?
 

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plenty on here if you use the search function :p
You will need more than 2 pairs of transistors per channel (more like 8-10 pairs), and certainly better devices than 2955/3055, to get 300W into 8 ohms... and at least 85V supply rails.

It will need a huge heatsink, and will not be cheap.
 
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