Pair NOS vintage 1970s GE JAN 5687WB tubes, longest black plates, O Getters, both test new/balanced with matching outputs, on my calibrated B&K Mutual Conductance tube tester. USA, 1970s, Military Spec, Boxes, Ex performance and sound quality. They both test over 1000, where 640 is minimum good, new with matching outputs. These are known for their excellent sound quality, musicality and dimensional sound. The shipping cost includes safe packing, insurance, prompt shipping and tracking number. Buy with confidence, see my feedback. Good Listening, SonnY :)