I am up and running and the Burson HD op amps are a very worthwhile addition. Wow! The tube side of the Music Hall 25.3 DAC isn’t so soggy anymore.
The big benefit was to the balanced SS output, which bypasses the tube and output caps. The bass was kind of soft before, sounded thin. Now I have bass, nuance and weight to the music. It tuned this $600 retail DAC into something special.