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Why is it a Waste of Time to Roll 12AU7s?

Timbo,
Are you saying the tube can not impact on the sonics due to its archetecture, or that they all sound bad, so what's the point?? I have seen many amps that employ them, why are they used so often?
I have rolled many 12AU7s and found definite changes in the sound of my amp. I ended up using 7136s in place of the 12AU7s in my Jadis DA-60 integrated. I am no EE and not tech savvy, so I don't know what they do in the circuit. The DA-60 requires 3 X 12AU7 and 2 X 12AX7 in the "preamp" section.


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