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Actually, I believe is is the other way around. The 809 and 815 are a bit NEWER than the 991. ALL are pretty similar, the biggest difference is the 815 is a cold chassis, I believe it had a VRT power transformer also. The 809 and 991 are hot. Most modules between the 809 and 815 are the same, IIRC< other than the power supply and maybe the pincushion module or such.
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