Unless you are talking about the GFP-750, be wary of expensive upgrades to Adcom preamps. You'll quickly find yourself throwing money at products with limited performance potential and poor resale value. "Reasonably priced" and cottage industry audio modifications don't co-exist in the same universe. If someone has the skills to experiment along these lines without incurring labor charges, fine, go for it. But if you are paying someone to do these mods to a mid or lower level adcom product, you might as well pour money down a hole IMO.
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