Buffer 6N3 Tube Preamp Amplifier Kit With 110V 220V Compatible TransformerDescription:- This pre-amplifier is based on famous Matisse circuit and made some improvement、 not only broadened the frequency response and improve low frequency extension. Its    voice is smoother、 juicier and more exquisite. The main circuit PCB thickness is about 2mm、 so that plugging and unplugging the tubes will not damage the board easily.    The top PCB can be decoration、 shield、 and anti-shock、 the design is very user-friendly. Uses 6N3 tubes、 high voltage capacitors、 1% metal film resistors、 all material is hi-fi    grade. With a small PCB layout、 good appearance and clean design style and tube at the bottom with green LED、 makes it more pretty. The pre-amplifier has been welded    and tested、 you can use it directly after buying it.- Magnification: about three times- Voltage: AC170V AC6.3V- Transformer setting: Red ones are AC IN、 Blue ones are 170V OUT、 white ones are 6.3V OUTNote:6N3 tube is no longer produced、 most of the 6N3 tube are disassembled from other product、 but all of them have been tested、 please note about it before you buy it.Package included:1 x Assembled Preamp Amplifier2 x Tubes1 x 110V\/220V Compatible Transformer