I fail to see the usefulness of a component such as this... Its low distortion obviously removes it from serious consideration in high-end audio equipment. Lack of the necessary distortion means that it can't clean up muddy midrange audio, nor can it make bright, crispy highs where there aren't any in the original signal. And the low end will be miserably lacking because of the obvious lack of 2nd order distortion which makes those cool guitar riffs sound so tight and mellow. The noise spec is nothing to write home about either, since it's the single factor that gives recorded music its "character". Without the low level background noise, everything sounds like it was recorded in a vacuum. It's widely accepted that humans can't live very long in a vacuum, therefore, the music will sound lifeless without the necessary noise. I hope National, and all other semi mfrs take notice of these issues and stop making such obviously low quality parts. There's just no need for them in today's leading edge audio systems.
Audiofoolery will prevail in the end!!!
{;>)