Friends, welcome, There are too many models of this product to display one by one. Please contact us and we will reply you within 1 minute , or if you want to order in large quantities, you can contact me and I will give you the bestprice . Please check your messages and confirm the details before we proceed with shipment. Additional Shipping Fees & Price Differences: In some cases, if the weight or volume of the goods in the order exceeds the free standard, or if your address is not in our regular free shipping area, additional shipping fees may need to be paid. Other related expenses: Due to different import policies and fees in different countries, additional fees may be imposed when purchasing our products. We strive to ensure transparency on all costs, but specific amounts may vary depending on shipping destination, shipping volume, and other factors. Improved 8C nickel-based amorphous C-type output transformer, 3.5K: 4 ohms 8 ohms: specially built for 300B and other electronic tube machines. The iron core is a British nickel-based amorphous C-type iron core, a second-hand iron core, the iron core is very thin, similar to the natural insulating mica ore, it can be peeled layer by layer and it is extremely brittle, and it will be pierced into the hand when the iron core is installed accidentally. Use imported second-hand amorphous alloy materials to wind the basis of the output transformer. The magnetic field line distribution and structure of the iron core have unique physical characteristics and advantages. High magnetic flux, reasonable design, and complicated process winding method are the secrets and guarantees for the good effect of this transformer. The winding output transformer has high and elegant high frequency, sweet intermediate frequency, stable low frequency, and has a better charm than many high-priced silicon steel chips, making the sound soft and durable, and the high and low frequency extension is wider, giving full play to the unique musical characteristics of the tube. The transformer is wound by 8C amorphous iron core, the wire package does not use organic materials, and the original cardboard is used for the wire package skeleton without a frame. A layer of insulating paper is wrapped around a layer of enameled wire, and layers of paper are wrapped around. The craftsmanship guarantees that no enameled wire is superimposed and not collapsed. The winding process is exactly the same as the transformer process of the early Shanghai Radio No. 27 Factory. Adopting the complicated 16-folding and 6-winding method, a total of 42 joints, which is time-consuming and labor-intensive. The skilled craftsman can only complete two wire packages in one day. Finally, the iron core is installed, vacuum dipping, CNC drying, and finished product inspection . Actual listening and audition, the whole frequency band is balanced, the low frequency is strong, the middle frequency density is large, and the high frequency is transparent and delicate. It is one of the high-end transformers, and it is better than the EI96 iron core output transformer for the British AUDIONOTE 300B single-ended tube amplifier. Measured basic parameters: The data will be different due to different measuring instruments, which are for reference only. Inductance: 18-20H Copper resistance: 3K5 195 ohms 8 ohms 0.7 ohms, distributed capacitance 3150p, leakage inductance 28mH Frequency response: 12Hz ~30KHz -3db. 16Hz ~20KHz -1.5db. 20Hz ~ 15KHz -0.8db. The output power is about 20W, and the working current is about 80-100mA. The volume is about 86mmX88mmX75mm and the weight is 5.6 kg/pair Evaluation: High frequency is elegant, intermediate frequency is sweet, low frequency is calm, and the charm is better than many high-priced transformers! ********************************************************************************************* There is also a 2.5K: 4 ohm 8 ohm single-ended output transformer as shown below: Primary inductance: about 27H, DC resistance about 217 ohms. Secondary DC resistance: 0.9 ohm. Leakage inductance: 15.4mH, Distributed capacitance: 7.1nF, Volume 82mmX65mmX100mm It weighs 4.8 kg/pair.

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