For consideration is an Ortofon ST-M25 MC Mono Step Up Transformer (SUT). It comes complete with the original box, manual, certificate as pictured. I used it in my system for a short time, then went a different direction. I was very pleased at the difference it made with my mono records though when matched with the CG25DI. It gives a 12db boost, and is a 1:4 winding ratio SUT. Its a great match for the Ortofon CG25DI series when combined with a Moving Magnet 40db phono stage. Its also very nicely made and sturdy. These retail at over $700 US, and are hard to find used, so heres a chance to land one at a decent price. Specs:Frequency: 10-100 kHz +/- 1 dBStep up: 12dB (1 kHz) CA/CG 25/65 Di MkIIInput impedance: 5 ? - 50 ?Load impedance: > 47 k? // 200 pFDimensions: 65mm(W) × 39mm(H) × 98mm(D)Weight: 410 gShipping: Multiple services offered, see Shipping Tab and pick the best option for your Zip. Bid with confidence, long time Ebayer with many satisfied customers.