All of these have been tested with a simple tester which does NOT measure strength of the tube. All were good. Some boxes are marked in pencil: 12AV6,12BH7A, 6BE6, 6CU8, 3AF4A, 6CD6GA all marked as NEW. 4DT6, 6CQ8 marked as USED. 6T8A, 6BS8 UNMARKED. Others are marked as USED, and some are not marked. See photos for condition.

I do combine shipping. If you purchase more than one of my items, do not pay right away. I will send you an invoice that will combine shipping, making your purchases cheaper to ship, saving you money. I do not accept returns, so view all photos and ask questions before purchasing.