Dr. John,
I have been experimenting with Psvane 12AX7 in my Vac amp in position V01/02 and 4. With Psvane in pos 1&2, you will get a deeper soundstage, super black background and more transparency but will lose some bloom and a more forward soundstage that the stock 12AX7 provide.
The Psvane in pos V04 provides the best compromise with the bloom of the stock tubes but with more transparency, lower floor noise better placement of image with the soundstage...
Still debating the Psvane KT88 TII...
I have been experimenting with Psvane 12AX7 in my Vac amp in position V01/02 and 4. With Psvane in pos 1&2, you will get a deeper soundstage, super black background and more transparency but will lose some bloom and a more forward soundstage that the stock 12AX7 provide.
The Psvane in pos V04 provides the best compromise with the bloom of the stock tubes but with more transparency, lower floor noise better placement of image with the soundstage...
Still debating the Psvane KT88 TII...