Received date: June 9, 2015
Sophia 12AX7 compare to Siemens 12AX7
Bass definition is much better on Sophia
Midrange bloom is almost as good as the Siemens
Top End almost as good as the Siemens
Soundstage and tonality are equal on both tubes.
I am hoping as the tube breaks in that it will be as good as the Siemens 12AX7. Right now I have about 15 hours on to the tube. So far itís a good value compare to the Siemens 12AX7 considering it is about half the price. NOS Siemens are going for $175-$225.00 on eBay.
Ray, New York