![Pro-Ject Tube Box S2](http://www.hifihut.com/cdn/shop/products/pro-ject_tube_box_s2_-_black_-_a_1_fb705e40-2f9e-4490-915c-6bb40f02de97_700x700.jpg?v=1636565654)
Pro-Ject Tube Box S2
The Pro-Ject Tube Box S2 is the 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.