Well, 2 days listening to the Modwright 9.0 Signature w/NOS Tung Sol and Sylvania recitifer, and it sounds like a perfect match for the DNA-125 rev. Gold. This is probably the best I have heard this amplifier sound. Huge soundstage, very natural and dynamic. Beats the last 3 preamps I have paired with this amp: Herron VTSP-1a/166, Audio Research LS26, and Dehavilland Ultraverve II. Plus, it is extremely quiet, something I couldn't say about either the ARC or Herron when paired with this amp.
I bet the LS36.5 would be even better!