Modifying Marantz 2015

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Hey guys, I hope this is the right forum to ask this question.

I've got a Marantz 2015 receiver that fried the amplifier board, so I'm looking to replace the amp board with a newer chip amp board and retain all of the other pretty functions. Basically, it's a beautiful enclosure and I'd rather replace the amp board instead of fixing the blown 15w per channel board.

Here's what I'm thinking, can you provide guidance if I'm missing something?

I've pulled the amp board, and the original power supply sends 50v to the amp board. Most amp modules I'm looking at require much less (tpa3116 or tda7492) voltage so I want to use a buck converter to efficiently step down the voltage and increase the current.

Buck converters that handle 36v input are chea, but finding one to handle 50v+ is difficult and more expensive. Is it possible to use two lower capacity buck converters to step down the 50v PS or should I use the higher voltage buck converter? Or maybe design one from scratch?

Further, are there any chip amp modules that can handle the 50v from the PS without any buck converter?

I can provide original schematics and pictures If necessary.


Thanks,
Jonathan



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