A major difference between the two is of course the wattage, the head version is 120 W while the 112 is 60 watts. As far as I know, the 120 W heads were also made in the US until recently (think they've moved the production to China now), while the 112 has always been made in China.
I had a 6505+ 112 combo for a while, but sold it due to it breaking down on me twice. It did sound pretty good, but can't really comment on how it compares to the head as I haven't tried that.
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