Description <br> 100%Brand New and High Quality <br> Power input: AC 12V 1A 5.5*2.5 PLUG <br> Channle: 2.0/ stereo <br> Potentiometer Role: Volume adjustment + Power Switch <br> <br> FE-6J1-2 fever tube pre-amp board is the circuit schematic design imitation crew Music fax X-10D,to be rational optimization,more stable performance than the original machine,tube play 10% increase. This board uses a single 12V AC input,the circuit processing provides 6J1 tube needed positive and negative voltage and filament power supply voltage. <br> Power works: an open power tube filament heating is started,when the boost from the zero-voltage start boosting hot filament tube,etc.,also happens to boost boosting finish,so this is the same with the guts rectification,8*470UF the capacitor filter very clean,good power supply system will not have a hum,the filament is 12V DC power supply,need two filament tube is connected in series with a DC filament also in order to reduce the noise. <br> Color as shown <br> Material: plastic + metal <br> SIZE: 77MM * 75MM * 52MM <br> <br> Package Contents: <br> 1* 6J1 tube preamp amplifier board <br> 1* parent shell parts <br> 1* Instruction manual <br> 1* Screw package <br> Note: This is Diy Kits. you need do it yourself. <br> <br> Only the above package content, other products are not included. <br> Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. <br>