Tube Preamps that work well with SS amps?

McIntosh MC500 and C2300 tube preamp. Also an Mx110z and MC30s both of which are tubes. A tube amp and preamp doesn’t necessarily produce the results you’re are referring. 

An Audible Illusions 3A worked very well with my Adcom 555 and Meitner STR-101.

Other than when there is an impedance mismatch between them, are there any other circumstances under which a tube preamp + SS amp combo will not work well?

@twoleftears  The main issue is probably how well the preamp does in the bass. This is an impedance issue, but its the impedance of the preamp at 20Hz, not 1KHz, where output impedance is usually measured. With most tube preamps the output impedance rises as the frequency goes down; at 20Hz it can easily be several times higher than its 1KHz value.

This is part of why solid state preamps might play deeper bass- they may have a direct-coupled output. You can have a direct-coupled output with tubes too; there are only two preamps I know of, the Atma-Sphere preamps which have a balanced output, and the Messenger which has a single-ended output.

I have many customers driving my amps with Schitt Freya+ and are very happy.

I have been using a Sonic Frontiers Line 2 with both Bryston 4BST and a BAT VK655SE.  No issues either way.  Both sound wonderful, but different.  The BAT lacks the imaging and impact of the Bryston.  Yes i was Very Surprised especially about the dynamics.  The BAT is mellower and maintains it's composure at very high dB's.  I am driving Maggie 3.7i in a large room with high ceilings.