More from Amazon.com : http://www.amazon.com/gp/product/B00A7IZTM4?tag=thefatkidin06-20 <br /> <br />YAQIN MS12B 12AX7 X2 TUBE PreAmplifier Integrated Amplifier and Phono Stage <br /> <br />The filament of electron tube refers to DC power supply <br />Black lacquer pickup amplifier
