Aric Audio Systems Unlimited Preamp

@aricaudio,thanks for the recommendation on the signal tubes. I just popped in a pair of new Mullard 12ax7's. I find them to tighten up the bass a bit,and bring the mids just a smidge forward. So far they seem to work nicely. Always trying to kick it up a notch!

@jgoldrick,thanks for your recommendation as well. Funny how different things work for different ears. I will definitely look into a pair of the Sylvania's. I swear,this hobby is a sickness. ;)

Look here and scroll all the way down.
I found this chart to be pretty darned accurate . Maybe it will help some of you here .
This is for NOS tubes not new stock. 
https://tubeworld.com/12ax7.htm

Here are a couple of comparisons/reviews for the new stock 12AX7 tubes:

https://www.thetubestore.com/12ax7-tube-reviews
https://www.tubesandmore.com/tech-corner/12ax7-comparison-current-made-tubes

grey9hound and kalali ,thanks for the links. Very helpful.

By the way, I must mention that the quality of the phono stage in the Unlimited is also pretty decent. Anyone considering using a turntable may want to opt for low(er) noise (and/or lower gain) tubes depending on the cartridge used.The linestage is dead silent regardless of the tube choices once the gain is optimized based to the amplifier input voltage sensitivity and the speakers’ efficiency.