Great phono section, otherwise a piece of shot. The unit contains 14 relays and if they have not been upgraded to the sealed nitrogen units, stay away from em...
The 3300 II, 3600, and 3800 are good units. Signal to noise ratio is the difference, in decibels, between the noise floor and max output.
Used to judge how quiet and we'll built the unit is. Poorly designed and built components do not have good SNR.