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That will be step 1 to what will probolly become quiet a bit of problems. I'm not huge on this unit but generally speaking if you opened the chassis your going to see a few burnt components (rectifier,diodes,transistors). But lucky 220 hits so hard it's usually just a replace the stuff you see burnt (get schematic if possible) it's a pretty straight forward repair.
I have 2 12" kenwood speakers on a 1000 watt amp ... the other day they cut off but the speakers arent blown, i replaced every fuse in the amp and the amp still cuts on when i turn the car on, yet the amp seems to not be pushing the speakers ...i also looked at the main fuse under the hood of my car but i cant tell whether its blown or not, why is my amp not pushing out any power?
the transformer has an internal thermal fuse. If you study the terminations coming out from the internals of the transformer you may notice either a pair of tinned thicker wires or insulated. This may be open circuit. I have often bypassed this internal fuse(they are notoriously common failures) to get a transformer going. You can get a replacement one from a parts supplier if you felt the need. I would just bypass it anyway.:)This may make the amp somewhat "illegal" in the US. We use the MEN (multiple earth neutral) mains power distribution in Australia and the transformer(if melting) would short out to earth and blow the mains primary fuse, the internal thermal is a US requirement.
Since Acoustic Research went out
of business, I too have been looking for a solution similar to yours. I may have found
an alternative to throwing away this really nice speaker. I found a
company on the web that appears to sell an amp that may fit nicely into
this speaker enclosure for $99.00. Check it out...