US Amps B-52

Anyone have any pics of the circuit board ?

Or know what diode goes here and what this jumper is for ?
 

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Yes I have tons of large diodes .

I have a lot with the markings 6A

Also the diode that came out of the board location looks like the BYV20-150 found in fosgate amps .

Here is a pic of the original diode but to badly damaged to see a part number
 

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BYV27 or BYV28? If you have the BYV28, it would work but I'd use a larger diode. All it needs to do is to conduct between B+ and ground if the amp is connected with reverse polarity. Neither the BYV or a 6A diode is likely to survive. They tend to be more, an indicator that the amp was incorrectly connected, than anything else.