1. The MX50 SE Version Is A Version Based On The Fifth Version Of The Mx50, An Improved Version Of The Classic With Thousands Of Users. 2. Low Distortion, Better Control And Resolution. Single Differential Input, Single-Ended Voltage Amplifier Stage, Three-Stage Inverted Darlington Output. 3. The Mx50 Se Version Is A Newly Designed Version Based On The Fifth Version Of The Classic Mx50 And Has Thousands Of Users. 4. All Resistors Use Metal Film Resistor Copper Pins. 5. Installation Note: Must Be Installed On The Included Radiator. Support Dc Voltage: + -15V ~ + -45v Ac Dual 12B - Dual 32B Rectifiers Are Available. Tips: No Adjustment Is Required After Installation. The Quiescent Current Of Each Tube Is About 30mA. This Version Requires No Flying Wires. Just Install Two Large Tubes On The Radiator. Note: Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:As Shown Material:PCB Package Contents: 2 x Board Power Amplifier Module Parts 1 Set x Installation Tools Only the above package content, other products are not included. Note: Light reflection 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.