JL Audio HD750/1 part ID

Center lead is grounded. D519 is SF1606G
 

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The photos I have show a transistor there but they are rev1.

The only thing I can think of is the same configuration as the JL1000 where the outer legs of the rectifiers are directly connected and the center leg of the negative rectifier is ground. Alpine uses the same scheme in the 1507.

If this is what they're doing, the suffix will be GA (common anode)
 

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