1. The MX50 SE Version Is A New 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 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 Not Affect The Use Colour:As Shown Material:PCB Package Contents: 2 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.