The Telefunken 12AU7's / ECC82's are going to be a little more, errr, analytical than the Amperexes. Installed in an older C-J preamp, I can see a good balance being achieved. Less so in a modern preamp that is less warm.
Mine definitely does. Telefunken 12AU7s sound drab in my BHK preamp while Amperex 7316s sparkle. It just confirms that there are no absolutes in audio.
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