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A 12AY7 might be a better choice.

Posted by Timbo in Oz on June 15, 2012 at 16:20:24:
Too often IME 12AT7s are quite steely in tone.

NB it doesn't HAVE to be a 6072 hand-selected for super quiet, and rolled on a virgin's thighs, maate. It's not a microphone amplifier now is it?!

Basic 12AY7, should have enough gain and you can probably use less NFB, which can't hurt.