This was used in my grandfather's homemade audio set. It seems to have been handled with care, but details and operation are unknown. Thank you for your understanding. Other audio parts (transformers of different sizes, vacuum tubes, etc.) are also on sale, so please take a look at those as well. *Everything in the photos is included. Please check before purchasing. *Usually, we can ship the same day, but due to frequent business trips, please contact us if you need it urgently. *Operation is unknown. No claims and no returns are accepted. #audio #vacuum tube #LUXMAN #LUXKIT