Fangrui Product Details 1. A970/c2240 High Voltage Audio Pair Tube Dual Differential Circuit And A1145/c2705 For Voltage Amplification 2. Promote The Use Of Medium-power Pair Tube A1837/c4793, And The Output Stage Uses A1943/c5200 High-power 3. For Controls. Wide Power Supply Range, Dc Plus Or Minus 20v-90v Is Acceptable, As Long As Sufficient Power Is Supplied 4. Easily Reach 200w, The Sound Quality Is Good, The Driving Force Plate Is Strong, And The 15-inch Speaker Can Be Pushed Without Any Pressure! 5. Need A Professional To Install The Corresponding Accessories To Avoid Damage To The Accessories :undistorted Power 200w (maximum Power 300w) Note:different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Not Affect The Use. Colour:as Shown Material:pcb Size:power Amplifier Board Size:about 120x60x45mm (length X Width X Height) Package Contents: 1 * Amplifier Board Module Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May