Nobsound NS-01P Tube Preamp Preamplifier 12AX7 ALPS27 Base on Maratz 7 circuit,The classic circuit, with the best material,make the sound of this tube preamp Transparent, delicate, voice is fantastic. Circuit: Each channel with a 12AX7 voltage amplifier, DAN1 connect cathode follower as signal buffer, it ACTS as the shot with the device, so that can have low output resistance, the circuit characteristics is the overall loop feedback design, this is a major factor Marantz7 fame.6Z4 tube rectifier used in high pressure parts. Materials: 1.Potentiometer is one of the most expensive ALPS27 potentiometer, the output terminal for the best American CMC. 2.All high-grade aluminum alloy chassis. 3.with the highest class of philips, WIMA High voltage capacitor. 4.resistance are catch DALE resistance of the United States and Japan KOA series. 5.Gold plated pin tube seats. External dimensions: W202 * H80 * D282 mm Input voltage:110V/240V (pls mail me for the voltage you want.)The default version in our USA stock is 110V version.Packing List: Tube preamp*1 power cord*1 Please note that this is not a PHONO preamp. It cannot be used for turntables without a PHONO preamp.