MC Step Up Transformers are sold as a pair. We manufacture after your order. We can ship your order within about 6 to 8 weeks! We are phasing metal cases to a new style. As soon as current inventory is gone all cases will be the new style. Please ask any questions or special requests before you pay! ~~Made in Japan Quality~~ All price is for one pair. Please check other transformers in my store! Please see datasheet for the detail. A FM-MC100 comes in a single layer shielded box. Two more additional layers of shielding is recommended for minimum hum. We can also provide custom designed Finemet transformers, please send us your inquiry. FINEMET Story:All our transformers are designed and manufactured by Mr. Suzuki, General Industry in Saitama Japan. Their transformers were sold through Noguchi transformer in the past. They also supply well known Japanese audio companies. He is also well known field coil speaker designer and leading transformer designer. Winding material and technique is also very important trade secret. He spent several years for refinement. Our Finemet Transformer has very good phase response, in other words VERY transparent. It makes very difficult to use with components with strong personality such as electrolytic capacitors, transformers and chokes with other core materials.For success with Finemet Transformer, we need to use all Finemet iron with film capacitors that have good phase response. Choke input power supply with Finemet Choke is the choice of our power supply topology. More about FINEMET:FINEMET® is registered trade mark of Hitachi Metals Ltd.FINEMET® is Nanocrystalline soft magnetic metal which is special amorphous metal. It's phase characteristics is far better than conventional core material such as Ni and Co-based amorphous metal. Features:1) Satisfy both high saturation magnetic flux density and high permeabilityHigh saturation magnetic flux density comparable toFe-based amorphous metal. High permeability comparable to Co-based amorphous metal.2) Low core loss1/5th the core loss of Fe based amorphous metal andapproximately the same core loss as Co-based amorphous metal.3) Low magnetostrictionLess affected by mechanical stress. Very low audio noise emission.4) Excellent temperature characteristics and small aging effectsSmall permeability variation (less than ±10%) at a temperature range of -50°C~150°C. Unlike Co-based amorphous metals, aging effects are very small.5) Excellent high frequency characteristicsHigh permeability and low core loss over wide frequency range, which is equivalent to Co-based amorphous metal.6) Flexibility to control magnetic properties?B-H curve shape?during annealingThree types of B-H curve squareness, high, middle and low remanence ratio, corresponding to various applications.Payment:Paypal Shipping and Delivery Time:Shipping is Free.We need about 6 to 8 weeks before the shipping.Buyer is responsible for the duty. Audio FeastWelcome to The Audio Feast Store. We supply premium audio components from world wide. We are a distributor for the world finest fullrange speaker by Mr. Teramoto. Other products include custom Finemet core Audio Transformers, Finemet core Power Transformers, Finemet core Chokes, and Urushi finished capacitors. We supply components to both DIY and OEM.Audio Feast is located in Music City USA, Nashville TN. We are new to this business. If you have any questions about Audio Feast products, please contact