FWIW, Mullard 12AX7 reissues made a huge improvement in my C220. McIntosh has told me that, other than the phono section and a few features, the C220 and C2300 are the same.
I bought 12ax7 Telefunken tubes from Brent Jesse Recording Supply Illinois and am extremely happy with the results! Best $200 bucks ever spent! Mark McCune
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