IWISTAO 40W 5K 1 Pair Push-Pull Tube Amplifier Output Transformer for For 300B 2A3 PP Amplifiers

IWISTAO 40W 5K Push-Pull Tube Amplifier Output Transformer 86 × 50 Core | 5KΩ P-P | 4Ω / 8Ω Output | For 300B, 2A3 and Other Push-Pull Tube Amplifiers Model No: WHFTR-PPOPT5K This high-quality 40W push-pull output transformer is designed for DIY tube amplifier projects requiring a 5KΩ plate-to-plate primary impedance. It is suitable for push-pull output stages using tubes such as 300B, 2A3, and other compatible power tubes. The transformer uses 86 × 50 grain-oriented silicon-steel laminations and high-quality oxygen-free copper enamelled wire. A carefully designed sectional winding structure improves magnetic coupling between the primary and secondary windings, helping achieve wide frequency response, low leakage inductance, and improved transient performance. With a specified frequency response of 28Hz–39kHz (-1dB), this transformer is suitable for high-fidelity tube amplifier designs where extended bandwidth and accurate signal transfer are important. Each transformer undergoes controlled drying and vacuum varnish impregnation, improving winding stability, insulation reliability, mechanical strength, and long-term durability. Features 40W push-pull output transformer 5KΩ plate-to-plate primary impedance Secondary taps for 4Ω and 8Ω speakers Suitable for 300B PP, 2A3 PP and similar tube amplifier circuits 86 × 50 grain-oriented silicon-steel core High-quality oxygen-free copper enamelled winding wire Sectional / interleaved winding construction for improved primary-to-secondary coupling Wide bandwidth design: 28Hz to 39kHz (-1dB) Primary inductance up to 35H CNC-controlled drying process Vacuum varnish impregnated for improved insulation and reduced mechanical vibration Heavy-duty construction for Hi-Fi tube amplifier DIY projects Specifications Parameter Specification Transformer Type Push-Pull Output Transformer Rated Power 40W PP Primary Impedance 5KΩ P-P Secondary Impedance 0-4-8Ω Primary Inductance 35H (P1-P2) Frequency Response 28Hz–39kHz (-1dB) Core Specification 86 × 50 Core Material Grain-Oriented Silicon Steel Winding Wire Oxygen-Free Copper Enamelled Wire Overall Dimensions 88 × 100 × 75mm Weight Approx. 2.4kg each Pair Weight Approx. 4.8kg / pair Recommended Applications This output transformer can be used in a variety of push-pull vacuum tube power amplifier projects, particularly designs based on 300B or 2A3 power tubes. Its 5KΩ primary impedance and 40W power capability also make it potentially suitable for other push-pull tube configurations when the required load impedance, operating voltage, plate current, and output power are compatible. The 4Ω and 8Ω secondary taps allow connection to commonly used Hi-Fi loudspeakers, making it a practical choice for custom tube amplifier construction, restoration, and advanced DIY audio projects. Built for High-Fidelity Tube Amplifiers An output transformer is one of the most critical components in a tube power amplifier. Core material, winding geometry, primary inductance, leakage inductance, copper resistance, and inter-winding coupling all affect bass extension, high-frequency response, distortion, and overall sonic performance. This transformer combines a substantial 86 × 50 laminated core, 35H primary inductance, carefully sectioned windings, and vacuum impregnation to provide a solid foundation for a high-performance push-pull tube amplifier. Package option: 1 pair