Can this be Upgraded?

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OK, I just bought a prototype amp off of ebay from a company called Quad Audio just because I was curious. Well, I pulled the back panel off & to my untrained eyes, it appears to be a decent amp with more potential. I found that it had 4 spaces on the output side with unused FETs. Would it really be as simple as throwing in more matching FETs & resistors/diodes to upgrade this thing, or would a power supply upgrade be necessary. I know just about enough to be dangerous which is why I'm asking.

Here's some pics:
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
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