Not everyone knows that this tube has very similar characteristics to the 12AY7/6072; the gain is almost identical, and it is also very similar to the 12AT7/ECC81.
We have tested this tube in hundreds of amplifiers using 12AY7s, and 100% of our customers prefer this 6414 tube because its performance is superb, with significant improvements.
These are tubes of extremely high sonic quality, superior to the classic 12AY7 or 12AT7.
Many of my customers who own Kondo or Audio Tekne amplifiers, or other brands,
have permanently replaced them.