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IWISTAO 5H/250mA Tube Amp Choke Coil 1pc Filter Pure OFC Wire with Shield Cover Audio DIY. Model No: WHFT-CH011 Copper wound. Fully shielded design, completely solve interference of the circuit itself. A sufficient amount of inductance, flat short individuals, can be easily applied to a variety of tube amplifier and all kinds of tube preamp / headphone amplifier inside a small box, easy to install, effect is significant. Specifications 1. All shielded choke 2. Inductance :> 5H 3. Working current 250mA 4. DC resistance is less than 100 5 ohms. Dimensions (L * W * H): 70mm * 70mm * 58mm 6. Install the center pitch: 71mm 7. Weight: 1kg