I used to own both those amps -- the 200 is the predecessor of the 220. The 200 has sharp fins, and the 220 has rounded heat sink fins and sounds 8.14 percent better than the 200 (IMHO).
Actually I did not like the sound of the 200 in my system, even though it got good reviews (probably 3 decades ago). The 220 is a smoother, better sounding amp, for sure.
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