IWISTAO 30W 1 Piece Push-Pull Tube Amplifier Output Transformer for KT88 EL34 6P3 PP Amplifiers

IWISTAO 30W 1 Piece Push-Pull Tube Amplifier Output Transformer for KT88 EL34 6P3 PP Amplifiers 5.5KΩ UL • Japanese Z11 EI Core • 4Ω / 8Ω Model No: WHFTR-PPOPT55K30W The IWISTAO 30W Push-Pull Output Transformer is designed for high-quality DIY vacuum tube amplifiers, combining premium materials with traditional multi-section winding techniques to deliver excellent bandwidth, clarity, and musical performance. Built with imported Japanese Z11 0.35mm high-silicon audio-grade EI laminations and European imported oxygen-free pure copper winding wire, this transformer is carefully manufactured for demanding Hi-Fi tube amplifier applications. It features a 5.5KΩ primary impedance, ultralinear (UL) taps, and 4Ω / 8Ω secondary outputs, making it suitable for a wide range of push-pull tube amplifier projects. Key Features · Rated Output Power: 30W · Primary Impedance: 5.5KΩ · Ultralinear Taps: Yes · Primary Lead Configuration: P1 – G1 – B – G2 – P2 · Secondary Outputs: 0 – 4Ω – 8Ω · Core: Japanese imported Z11, 0.35mm high-silicon audio-grade EI laminations · Winding Wire: European imported oxygen-free pure copper wire · Winding Structure: Multi-layer, multi-section construction · Interleaved Winding: 5 + 4 structure · Insulation: Pure wood-pulp insulating paper between winding layers · Winding Method: Precision honeycomb-style winding · Finishing Process: 24-hour varnish impregnation · Custom Specifications: Available according to customer-provided technical requirements Premium Z11 Audio-Grade Core The transformer uses Japanese Z11 0.35mm high-silicon steel laminations specifically selected for audio transformer applications. The high-quality core material provides excellent magnetic characteristics and is particularly suitable for output transformers where low-frequency capability, efficiency, and broadband audio performance are important. Oxygen-Free Pure Copper Windings The winding is made from high-quality European imported oxygen-free pure copper wire. Careful selection of conductor material, combined with precision winding, helps minimize winding resistance and insertion losses while maintaining excellent signal transmission characteristics. Multi-Layer & Multi-Section Winding Unlike simple conventional winding structures, this output transformer employs a sophisticated multi-layer and multi-section interleaved winding technique. The transformer uses a 5 + 4 interleaved structure, with insulating paper carefully placed between winding layers and sections. This construction helps optimize the relationship between leakage inductance, distributed capacitance, coupling efficiency, and frequency response, which are critical parameters in a high-quality tube amplifier output transformer. Every winding section is carefully insulated using pure wood-pulp insulating paper for reliable electrical insulation and long-term stability. Ultralinear Output Stage Support The primary winding incorporates dedicated screen-grid taps with the configuration P1 – G1 – B – G2 – P2. P1 / P2 are the primary plate connections, G1 / G2 are the ultralinear screen-grid taps, and B is the B+ center tap. This configuration makes the transformer suitable for ultralinear push-pull tube amplifier circuits, offering designers additional flexibility when balancing output power, distortion, damping, and tonal characteristics. 24-Hour Varnish Impregnation After winding and assembly, the transformer undergoes a 24-hour varnish impregnation process. This treatment improves electrical insulation, moisture resistance, mechanical stability, long-term winding reliability, and resistance to winding vibration and noise. Designed for Hi-Fi Tube Amplifiers The transformer has been developed around modern tube-audio design principles while retaining proven traditional transformer manufacturing techniques. Its carefully selected Z11 core, pure copper windings, paper-layer insulation, and sophisticated interleaved winding structure are intended to provide a transparent, detailed, smooth, and naturally warm presentation, making it an excellent choice for high-quality tube amplifier projects. Specifications Parameter Specification Type Push-Pull Output Transformer Rated Power 30W Primary Impedance 5.5KΩ Primary Connections P1 – G1 – B – G2 – P2 Ultralinear Taps Yes Secondary Impedance 0 – 4Ω – 8Ω Core Material Japanese Z11 High-Silicon Steel Lamination Thickness 0.35mm Winding Material European Imported Oxygen-Free Pure Copper Winding Structure Multi-Layer / Multi-Section, 5 + 4 Interleaved Insulation Pure Wood-Pulp Insulating Paper Winding Method Honeycomb-Style Precision Winding Treatment 24-Hour Varnish Impregnation Qty 1 piece Weight 2.8 kg Sizes As the photo shown below Package / Ordering Note The displayed price is for ONE output transformer. For a stereo amplifier, please order 2 pieces. Custom Winding Service Custom winding specifications are welcome. Customers may provide their required primary impedance, secondary impedance, power rating, UL tap requirements, and other transformer parameters for customized production.