IMHO the difference between the modded and stock MiniMax is this. The noise floor goes down considerably, the sound is smoother yet more dynamic yet more extended at both frequency extremes. The bass seems to go down another octave.
Using a 12FQ7 in the middle tube position, as this tube can now be used in the modded version as it is set to run this tube optimally is wonderful. I can't make up my mind though which I like better the 12FQ7 or the pinched waist 7062/E180CC D getter.
Both are outstanding in that position.
Jim, sidenote: only have a half dozen in stock of the phono pre's.
Jack, The mods only make the preamp better in all areas, What position on the volume control do you currently normally have the pre set at? With cutting the gain in half from 18dB to 9dB you will listen with more use of the volume control.