The Blackstar HT-5R Mk1 is a 5-watt tube combo amp designed for studio use and home practice. It features two footswitchable channels, Blackstar's patented Infinite Shape Feature (ISF) for tonal versatility, and stereo digital reverb. Its low-powered valve design provides rich, harmonic tones even at lower volumes. The amp also includes an effects loop, speaker emulated output, and MP3/line input for added flexibility​