This is a vacuum tube amplifier that uses transformers and choke coils from the current General Trans and the former Noguchi Trans. The transformers used are: PMC-140 OTN-42S PMC-1018HW The OTN42S is a reproduction model from SEL (Kanno Electric). There was an article at the time, so please take a look. The PMC-1018HW uses the more expensive hammered-tone finish. The 6BM8 is RSD-made, and the rectifier tube is a Toshiba 5RK-16. This time, it's not a ultra-triode connection, but a regular single-ended amplifier. There is no circuit diagram, but it is a typical 6BM8 single-ended amplifier. Capacitors include WIMA and dipped mica, etc. I've paid a lot of attention to the capacitors and transformers. Output is about 1W with an 8Ω load, and it is self-biased. The bottom plate is hollow, and insulators are attached to the four corners. Please take a look at the video. https://youtu.be/ZWQuUKh3RrI?si=y1N80U1PQmNFymu9 This is a personal item for sale, so please refrain from after-sales support or detailed questions. Discrepancies are inevitable regarding subjective matters such as noise when silent or scratches and dirt on the appearance. Please be sure to check the description, video, and images posted, and agree to the terms. In principle, no claims, no returns, and no cancellations are accepted. Please refrain from purchasing if you are a perfectionist or expect the same condition as a new product from the manufacturer. Please purchase only if you understand that this is a used, handmade, and vintage item.