I owned the T-61 before & it is one superb sounding tube preamp, right up there with the best. Wish I never sold it!
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Yours truely, I have owned both. The TAD 150 uses two 12AU7s, 12AX7s, or 12AT7s and has solid state rectification as where the T-61 uses two 6DJ8s (6922s) and has a tube for rectification. I will not say one is better than the other because they are both going to sound different but in a positive way & will come down to personal preferences. I will say they both sound excellent! Either way, you can't lose.