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6CG7 instead of 12AU7?

Posted by ChasLieb on October 6, 2015 at 14:55:34:
Other than the heater voltage, is the 6cg7 a substitute for the 12au7? The amplification factor, voltages and plate resistances are just about the same and the tube curves are much more linear on the 6cg7. Is the 12AU7 more suited to small signal amplification, i.e. less microphonic?

Just putting the question out there for thought.

Chas.