Little Bear T7 Vacumn Tube Mini Phono Stage RIAA MM Turntable Preamp & HiFi Tube Pre-Amplifier (Black) This product can be used as a MM Turntable Preamp or a HiFi Tube Pre-Amplifier This product can provide high fidelity and warm sound beyond your expectation Its tube can be directly replaced with tubes like 5654, 6AK5, EF95 .etc Its mini size makes it more portable and be suited for a variety of scenarios and Its alluminum body makes it strong and elegant. Now according to our customer needs, a Gain control switch has been added on the PCB.