I would recommend placing the requirement of fully differential balanced circuitry at the top of your preamp feature list. Balanced pays dividends with these amps.
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I strongly suggest you audition a used Pass XP10. I have the XA160.5 and XP20 and it is a superb combination. I agree with Tvad about going balanced with this amp. Also, forget a fancy power cord for this amp and put the $$ toward a better preamp. Auditioning is key. The XP preamps are considerably better than the Aleph P and X-1 that I had. Mark at RENO HIFI or your local Pass dealer should lend you one of the new XP's for trial.
I have the Pass XP10. I did own the Aleph P & X1 before.
The XP10 is just better everywhere, even though it is only 1 chassis. The biggest improvement I've found is in detail retrieval. My X1 had 31 volume steps. The XP10 has 64.
Even on 1 volume click, I can hear all the detail in a song, it's just at a lower level.
Your amps are truly balanced. Your preamp should be, too..
I don't have a specific recommendation. The point is to allocate your funds toward the electronics rather than power cords for the XA-60.5 amps.
will I hear any difference if not going balanced all the way ?Yes.
I apologize for my abrupt response above, its just that I dont like to make recommendations unless Ive personally owned the component or tried it in my system.
In the $3300 used price range, I owned an Audio Research REF3 preamp, which I do not recommend with the Pass Labs XA-60.5. The combination sounded flat and lifeless to me.
At the $2500 price point, I owned a Lamm LL2 Deluxe preamp, which matched very well and sounded quite good (but not quite up to the standards of the Lamm L2 Reference). However, the LL2 is not balanced, and I have suggested that you seek a balanced preamp.
When I owned the XA-60.5 amps, my preferred preamps were the SMc Audio VRE-1 and the Lamm L2 Reference both of which are well beyond $3300, and neither are tubed (although the L2 Reference has a tube power supply).
I tried an Atma-Sphere MP-1, which worked very well. Itd be a situation of user preference as to whether you would like the resulting sound. Again, though, its beyond youre the $3300 mark, although a used Atma-Sphere MP-3 would be in that price range but I havent heard one, so Im reluctant to recommend it without conditions.