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
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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.