Pair NOS JJ E88CC 6DJ8 Slovakia Tested Strong Life Test Great Vacuum TUBE All of the tubes were tested on a calibrated Sencore TC-162 tester, one of the best for detecting Shorts and Leaks as well as emission. Take a good look at the pictures as they give a much better description than words can. If you have any questions, please ask them before bidding. Shipping charge of $6.95 to anywhere within the lower 48 United States. Thanks