Once again WA7tp is power supply which replaces stock power supply included with amp. If you own WA6 you don't need WA7tp. Your way of upgrade should be WA5 or WA2 or WA22. I only heard WA6SE only once at the meet so can't comment it's worth to upgrade to it from WA6
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All of this is good to know. Thank you. I will look into the WA2 and the WA22. The WA5 is, I think, a bit out of my price range.