Setting Gain on Aesthetix IO/Signature

thanks Don & swampwalker for confirmig supposition. probably will begin with 68db setting & go from there.

Assuming you mean 0.6 mV as per quoted manufacturer's spec, you should be able to go quite a bit lower than 80 dB.  Doing so will reduce tube noise.  the KAB gain calculator https://www.kabusa.com/pregain.htm gives 55 dB, but ultimately, that depends on the overall system gain including your amp and the sensitivity/efficiency of your speakers. 

I ran my IO  wide open (80db) for a .2 mv Koetsu.  You shouldn't need that much gain for your Air Tight.  Yes- no doubt you can reduce noise by using less gain.  I would set your gain in the high 60's, and increase if you need to. I'm sure Albert would know more, but again, play around.  Cheers -Don