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tube recommendations?

Member for

17 years 10 months
Hi All, I'm told by a new friend made via RO that changing the tubes out in my ART Pro MPA can result in pretty decent preformance improvement. This year's shopping list is all about really good pres and comps, but for now, a cheap way to improve what I have sounds enticing. Any thoughts on different tubes in each channel for diffeent flavors? Thanks.