Assuming the minimum thd and im will never go below .01% for tube gear.
Also, wouldn't a 333 kilocycle/second sampling frequency generate significant
spurious distortion harmonics if using a 20 or 30 kilohertz test tone. At that frequency, it would only have 10 to 15 samples to recreate the input sine wave it must then analyze wih FFT. So wouldn't a 12 bit 100 ms/s do better for audio?