The tube box DS from Pro-Ject: all the sound quality and adjustability you'd expect from a full-sized tube phono preamp, but delivered in a package that practically fits in the palm of your hand. The ultra-low-noise circuitry developed by Dr. Sykora provides exceptional performance and flexibility with almost any mm or MC phono cartridge on the market. The use of high-quality Ecc83 vacuum tubes for the output stage translates into a noticeably warmer sound than the phono box S. All cartridge loading and gain settings are adjustable to meet the needs of almost any phono cartridge on the market via a bank of jumpers. A switchable subsonic filter at the rear of the unit allows you to easily eliminate the presence of any unwanted low-frequency interference below 20Hz. We've carefully selected the amplifier modules and incorporated audiophile-grade polypropylene capacitors to provide supreme clarity, accuracy, and sound staging previously unachievable at this price point. The tube box ds's superlative presentation of pure dynamics, full transparency, analog warmth, bass texture, and detail resolution can be heard equally across all audible frequencies, making it possible for you to enjoy your entire vinyl collection as you never have before.