I am selling a Fivre 6SL7 tube purchased from Italian-based seller ninonu123 (125), who has 100% feedback on ebay and was suggested to me by a highly trustworthy and active tube enthusiast and seller on Head-Fi. I used this tube for less than five hours in order to test it and am selling due to having purchased this as part of a matched pair, only needing one for my amplifier. Both tubes sound identical. The Fivre 6SL7 is frankly my favorite tube in the Zana Deux Super amplifier. Price is $90 shipped to CONUS residences or $87 + shipping to non-CONUS residences. Buyer must add PP fees. Thank you.