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Is Woo4 an upgrade version of Woo2, just like the way Woo6 is to Woo3?
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No, actually the WA4 is more like an upgraded version of the WA6, both are transformer coupled designs and according to Wei Wu have a similar sound signature. The WA3 and WA2 are both OTL designs, and reportedly sound similar (based on impressions I've read here).