Excellent early vintage NOS Tungsol 12SL7GT, Dark Glass, 1950s, incomparable vintage Tungsol design, craftsmanship and performance. These are known for their excellent sound quality. It test new and balanced on my Mutual Conductance tube tester. The shipping cost includes safe packing, insurance, prompt shipping and tracking number. Buy with confidence, see my feedback. Good Listening, SonnY :)