Pro-Ject Tube Box S2 Riaa/PhonostageKvalitets Riaa forforstrker Phonostage med rr til bde MM og MC pickup! Tube Box S2 is our very first product to feature a fully discreet circuit design without using any operational amplifiers (OpAmps). It also is the first product to come with replaceable tubes for tube rolling and sound shaping. This gives the customer many options to pick from and alter the sound signature to his preference. Tube Box S2 will give a full and relaxed laid back sound