This is the TANGO (Hirata Electric ISO) XE-20S transformer. It's a high-end transformer with a hammer-tone finish. It was removed from a working amplifier. I used it as my reference output transformer for a long time. Therefore, I believe it works without any problems. I was originally planning to build a vacuum tube amplifier and sell it, but I haven't been able to get the power transformer and chassis that would be its partner, so I've decided to let this go for now. Also, it seems that Tamura, Tamura Seisakusho, has stopped making audio transformers, so high-end transformers will inevitably become increasingly rare in the future. Please check the size specifications in the images. Please check the scratches and dirt in the images, and in principle, no claims and no returns are accepted. For some people, this could be part of their final amplifier. This transformer has that kind of potential. If it doesn't sell, I'll use it myself.