Comes with upgraded NOS mullard tubes warmer then stock. Preamp works perfectly.

The SOLO/610 mic preamp/DI box from Universal Audio brings the best of their preamp designs to a single-channel format. The SOLO series features the solid build and audiophile components that define UA quality. Its portable form factor is convenient for use in the studio and control room, onstage, and on your desktop. The all-tube SOLO/610 imparts its alluring, characteristic warmth to all your digital recordings. Vocals take on new life; direct bass sounds huge and round; drums sound fat and punchy. Take it from Sweetwater: if you want to make great-sounding music, you need the right front end: the Universal Audio SOLO/610