What tube pre-amps pair well with Pass amps?

One caveat to my points.
My preamps are very close to the Pass amps; so the interconnects are short. With a longer interconnect run, the balanced connections may possibly be superior.

@billtro Ama-sphere (unsurprisingly) makes preamps that conform. I presume that Pass does as well. Unsure unfortunately about other brands, perhaps some others will know of some options...

Pass Labs whether due to technological or marketing reasons promotes their “super symmetry” as a selling point. This might be best used in balanced mode. Some of the Pass Labs amps have a somewhat low input impedance.  If wanting to use tubes, I suggest considering the Atmasphere and Sonic Frontiers pres.

@cakids   +1 !

The bottom line is that preamp quality is more important than using the amp in the balanced mode.

@cakids
I have Pass Labs XA60.5 amps. My preamps are both Cary Audio - SLP-05 and SLP-98P F1 version. The modified SLP-98P sounds a tad better...

Last year when I was demoing different amps again, I asked Nelson about my own Cary SLP-98/F1 tube preamp pairing with a Pass .5 or .8 amp. He shared having many customers running them already. Guess it’s true :). A buddy with the XA-25 amp also tried with his own SLP98 preamp and liked the pairing a lot. We agreed it was not quite like his strapped triode tube amp, but really nice and musical!