SUT for AT-OC9XSL?

@lewm My amps have an input sensitivity of 1.25V,

my line stage is a VTL TL2.5i with 20dB of gain, and I am almost certain now I am going to get the Hagerman with the 48db of gain. Given that my cart out must 0.4mV, I would need a SUT with a 1:12 turns ratio…? 

I believe my current phono stage is rated at an Input Impedance: 100K ohms
Output Impedance: 600 ohms
Phono Stage Gain & Sensitivity: 70 dB, 5 mV. I am thinking about replacing it with a Hagerman Cornet2, which has only 44db of gain. I appreciate your response, I am still trying to wrap my head around all the science of how this works. 

@lewm if that were true, wouldn’t I have to have the volume on the line stage way lower (due to excessive gain) than my other sources? The way I have things set right now, I keep my volume at about the same position as my other sources. 

Assuming the signal of the turntable (because of the SUT) is much higher than it should be as it enters the line stage, the amount of gain (volume) you would use on the line stage preamp would be lower than normal correct? Let’s say my CDP inputs a signal of 1-2V, wouldn’t the turntable signal of the turntable be markedly higher than that (hence what makes it excessive gain), causing me to have to turn the gain (volume) on the line stage way down when on my turntable input to compensate for the additional gain that happens upstream of the line-stage? in other words, the the volume controls gain on the lineage right? So if the turntable signal is much higher than 1-2V (because of the gain in the SUT and Phono-pre combined) then that source would need less gain (a lower volume position) in the preamp line stage than other sources which are not amplified much before the lineage?