Maybe consider the Lamm LL2 Deluxe. It has synergized with the several amps I have tried it with. I believe the input impedance of the 350's should be suitable, but I only found the balanced input impedance on the spec page of their website, which was 75K ohms. One consideration, the Lamm has only single-ended inputs and outputs. Also maybe a VTL 5.5, which I found to sound good, but it is an older model. The VTL has only single-ended inputs, but does offer a balanced output. Another consideration for a dimensional and textured preamp that offers clarity and a very nice sound is the solid state Tom Evans Vibe with Pulse, and there have been some for sale here at reasonable prices lately. The Tom Evans is only single-ended. CAT preamps sound great, and offer tremendous bass, but they are not warm. Many like the Calypso (although I was not impressed) and it is also not warm.
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I like a somewhat tubey and warm sound, but not overly so. I also like laidback components as I fatigue from forward systems.
I am leaning toward a Modwright 36.5.
Your likes will not be fulfilled by what the Modwright 36.5 will provide, IMO.
Does your MW Transporter sound tubey and laid back? Bet it sounds neutral and balanced. The 36.5 will be more of the same. Modwright's house sound is consistent.
Depending on the tubes installed, Lamm, Joule, Cary, Juicy Music are preamps that will get you closer to your preferences, provided the impedance match is good.
The input impedance of the Classe 350 is 75,000 ohms (75k ohms), not 75 ohms. When Stereophile tested the output impedance, they measured 100k ohms at the unbalanced inputs, and 200k ohms at the balanced inputs. You want to mate amplifier input impedance with preamplifier output impedance.
With the Classe 350's high input impedance, you have the freedom to mate it with virtually any preamp, IMO.