IR DirectFet replacement.

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Anybody had any luck trying to replace these little monsters?
I normally just pass on repairing these amps but here lately I have had a lot of good long time customers begging me to repair them since nobody else will touch them ether.
I have a few Ideas but thought I would ask first considering all the combined experience on this forum.
My main concern is,that even if there is a way,how reliable would the amp be.
Of course Im referring to the Alpines.
 
Yes,that is the style.The last one I got uses an IR6665 which I think is even smaller.It is sandwiched between the board and heatsink with an extra small piece of aluminum and thermal heat pad.
I cant even imagine how you managed to fit a 220 case in there.That must have taken some major time and work.
 
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