This is a 6V6 vacuum tube amplifier, as previously requested. The 6V6 is a beam tetrode vacuum tube, similar to the 6L6GC and KT88. While it doesn't produce as much output as those, it has a unique sound that makes it quietly popular among enthusiasts. This unit uses a Mazda (TOSHIBA) 6V6 for communication equipment. The first stage uses a Mitsubishi 12AX7. All vacuum tubes are made in Japan. Output impedance is 8Ω. Approximately 2-3W. I've filmed a YouTube video for this, but it's somehow being flagged by Mercari's operations. Please search for it using the audio listening test video. Please subscribe to the channel. This is a private sale, so please understand that after-sales support and detailed questions are not possible. Subjective matters such as noise during silence and external scratches/stains are prone to discrepancies. Please be sure to check the description, video, and photos, 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 item to be in 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.