Two Pair (4) Audio tubes 6688 / E180F in old carton well-aged. Images are for General View. Some variation are possible. All in golden pins. All came in as a lot same time. Dozens sold. Widely used in professional Audio radio and testing equipments The improved version of E80F? Wide-Band Full Range 10,000 hours Long Life Pentode with Ultra-Low-Noise/Micrfonic? Sound Element Ideal for high end input stage for DIYer Unusual Quality Special Rate for delivery to China Taiwan Hongkong and Korea. electube Note: If you want More than pair please see our other auction.