Only sold on Mercari. It's old. New and unused. I have no knowledge, so I can't explain it. I cannot guarantee its operation. The storage condition is good. Please check the product in the photos. We are waiting for your purchase if you understand. #Vacuum tube #6AW8A #Toshiba #Hitachi #Mitsubishi #Audio If you purchase multiple items on sale at the same time, we will give you a discount plus α for the shipping cost, so please comment before pressing the purchase button. Discounts are not available after you press the purchase button.