Schrödinger Audio’s Red Thunder L6 is a compact vacuum tube HiFi audio system with in-built Bluetooth enabled devices. There are also two additional inputs for connecting CD/DVD player, tuner or phono preamplifier. Red Thunder L6 features two highly efficient 6L6 vacuum tubes, which are often used in guitar amplifiers to deliver a full and balanced audio across two channels. Red Thunder can drive speakers with a sensitivity as low as 85Db.