2SC4388 and 2SA1673 replacements?

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That amp is 800wrms, I don't yet have enough PS to stress test it. Not sure how else one would find out. I read on another board overseas that a guy had good luck with the ISC brand but can't find much else about it. I don't recall seeing them factory in any amps yet.

This time I needed the 1694 and that pacific semi did not have them or I would have tried them out.
 
a little help needed

hello. i blew up my 728 and am trying to get replacement parts for board position q202 and 204 there burned enough i cant see the numbers and kenwood want alot for those parts. any help leading to replacements would be great. thanks in advance
 
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