Directed 1100d amplifier Mono

I have this beast of a amp loved one reason is last thing I ever got from my before he passed well one it started to send a loud hi pitch thro the sub well I took the back off and this sorry caught it b4 it blew and now when I go to hook it and takes a sec for it to come on but it gets a I really harsd and loud sound throw the sub and I m trying to under stand fix because it can't be replaced in my book theirs some notes in their
 

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