Purchased at the beginning of this year. After cleaning with isopropyl alcohol, I confirmed that they produced sound, then placed them in their original boxes and stored them upright in a dark place until now. Item: Tesla, 1 double getter tube Item: 1 tube, markings faded Total: 2 tubes for sale Both tubes produced clear sound. They deliver a powerful sound. Both tubes appear to be Tesla, made in Czechoslovakia. Please purchase only if you understand and accept all of the above. ◆Price negotiations are welcome◆ Thank you for your consideration.