If NOS pre or power tubes became unavailable altogether, what new tubes would you buy?

Lowrider so far as lacking warmth, yes this may be true compared to the NOS Sylvanias, Ken Rads and a wonderful pair of National Union that I had in my Supratek years back  that to my ears at least had the most enjoyable midrange of them all. That said I find these tubes just sound more natural, certainly a matter of taste but that is more the direction my tastes have evolved. I still like the NOS tubes for sure but those Sophias are my current favorite, especially in my Modwright/Oppo. I have not tried the Psvane CV181, maybe it's time if it's a drop in replacement in the modwright.

and Raul I'm not at all upset with your choices, believe me. The point is that the thread is just not about what you're continuously bringing up, it is about new tubes to replace NOS tubes, that was my main  point and that of others but you can't seem to get it. So far as tubes vs SS I wouldn't feel compelled to get involved in such a thread as I've heard superb examples of both and your facts are not mine, sorry.

Thanks, @tubegroover . I looked up the Sophia Electric 6SN7's and they are compared to a VT-231, so that would make them closer in sonics to NOS. The fact that you are using them in your Modwright/Oppo tells me they must sound more enjoyable than the other new production tubes.

Although they are not inexpensive...hope they last longer than NOS 6SN7's.

A cautionary note about the Sophia 6SN7: See the following thread from 2012, in which I and another member both reported that it caused hum problems in our VAC Renaissance amplifiers, which I determined was due to excessive heater-to-cathode leakage.

https://forum.audiogon.com/discussions/vac-30-30-sophia-6sn7-s/

As I said in that thread:

The heater-to-cathode leakage in my Sophia’s, as measured on my vintage Hickok tube tester, was as low as 3 or 4 megohms on some sections of some of the tubes, and was in the 5 to 10 megohm area on most of the others.

I recall that Ralph (Atmasphere) commented some time ago in another thread that he rejects any tube measuring less than 10 megohms.

Also, I’ll mention that on my Hickok 800a tester all of the vintage 6SN7 tubes I have measure well above 10 megohms, and in many cases are high enough to be unmeasurable.

What I had purchased was a matched quad of Sophia’s "grade A" version of the tube ($100 per tube), with their optional one year warranty ($18 per tube at that time, which I see they’ve increased to $20). To update the history I reported in the other thread, I eventually had Sophia exchange the four tubes for a new matched quad, under the warranty. The replacement tubes worked well for a few months, even though their heater-to-cathode leakage did not measure a great deal better than on the first set. After a few months, though, the replacement tubes developed the same hum problem, and I retired them to my tube collection.

If I had speakers that were significantly less efficient (mine are 97.5 db/1 watt/1 meter), or if I had used the tubes in a different amplifier or other component, it seems quite conceivable that I would not have observed this problem.

Best regards,
-- Al

Thanks to all who have stayed with the initial question and purpose of the thread.  I thought about deleting the thread because of the direction the thread went. 

People, at least me, really do run searches on forum threads with the objective of finding answers.  Now, if someone searches and finds this thread they will get less answers about new tubes that people like as alternative to the NOS tubes that are expensive and scarce.  

Raul should start his own thread.  Too bad.