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Expanding on the WA12, which is based on the API 312, the TB12 adds enough options to make any gear-head tremble with joy. This is really a superb preamp, or multiple preamps in one, I should say. Unlike the API 512c and WA12, The TB12 has a built in attenuator so you can drive this pre all day. Figure the price of a 512c with an attenuator, you could have two TB12's instead. If you want value that reaches to the heavenly gates of the gear gods, start investing into Warm Audio.