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RE: NOS 12AT7 at "first 2 position (Cascode?)" in MP3?

Posted by MP on February 13, 2017 at 10:28:47:
Lew, thanks for your input. I removed the 4 phono tubes based on Ralph's post in 2006.

From Ralph: "The line section tubes last a very long time- if you run the preamp 24/7 they will go over a year with ease.
The phono tubes do not last as long- as they fade they become noisy. 24/7 operation will kill them in about 5 months. But if you are not using the phono, I would remove the rear 4 12AT7s (you need some of them in place, even though you are not using them). If you do decide to use the phono the good news is that the 12AT7 is inexpensive."

The reason I ask is to see if NOS tubes could sound better and last reasonably long. I have used different 12AU7 (amperex, RCA, Philips-Dutch), 5814A and 7316 tubes in line stage. These tubes do make quite different sound characters and last very long.