What are you presently using?
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I would suggest staying within the Pass family. If the X-1 is too expensive, and it doesn't have phono, then you could find a used Aleph P and Aleph Ono for about $2400 together. I used this combo with Pass monos before upgrading to the X-1 and XONO which are slightly more transparent and quiet for about $4000 used. I loved the black one-box, simple ergonomics of the Aleph line. Another advantage is that you can go balanced with either the Aleph or X lines for lower noise and 6db more gain.
Suggest going for a tubed preamp, but make sure it can drive the low impedance of the Pass Amp. I have a X150 amp and have run it with a Supratek and a Modwright. The modwright gain is a little high meaning that you can turn the volume up too much with efficient speakers. Not a problem for me since I have inefficient Eminent tech speakers. I am selling the Modwright, but I may keep it and sell the Supratek. Both great preamps that do different things better. The original X series Pass amps need a little warmth on the preamp. It think the Pass preamp would not give it to you.