The Dayton Audio HTA100BT Hybrid Stereo Tube Amplifier successfully employs contemporary amp technology that faithfully pay homage to classic amp design of the past. Utilizing the efficiency of solid-state class A/B amp topology and a vacuum tube preamp section- the HTA100BT authentically reproduces the warmth and character of tube amps with the flexibility the modern world expects. - - We stand behind our products and our warranty is a demonstration of our commitment to quality and reliability. - Key Features - Authentic vacuum tube warmth and character with class A/B amplifier efficiency produces an articulate and natural sonic experience - Powerful 50 watts per channel of audiophile fidelity that is sure to please even the most discerning ear - Convenient input connections including USB optical coaxial phono stereo RCA and Bluetooth V5 - Mono RCA subwoofer output gives you the ability to enjoy a 2.1 system when connected to an active sub - Brushed aluminum housing with vintage front panel VU meters lends a clean modern look with a nod to classic aesthetics - Short circuit protection circuitry to prevent amp failure - Built-in phono preamplifier to easily connect record players