Here is an early engraved case UTC 0-1 input transformers with the early dark gray 0-17 shield, the same as found in vintage Universal Audio 610 tube pre amps. These are really great sounding inputs, they can sound amazing if you hit them really hard and get them to saturate. They give a very smooth and creamy sound almost like a Neve 1073. It has been tested and working perfectly, the primaries are 50, 200, and 500 ohms with a 50,000 secondary with a frequency response of 30 to 20,000 Hzs. The 0-17 shields give an extra 25 db of shielding for super low noise pick up.