Douk Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier Stereo HiFi Buffer Preamp(Silver) Notice:  Preamplifier needs to work with amplifiers or active devices;  Not PHONO preamp and can't be used for record players Classic 6J1 tubes with optimized circuit offer classic music experience Tube can be replaced by 61, 6AK5,6BC5, EF40, EF95, CV8505654; Much fun and high playability DC12V 1A universal power supply; Can be used in most countries and regions All aluminium alloy shell; Gold-plated terminals; ENIG PCB