You are bidding for 1 Quad GEC KT88 6550 Black Plate OOO getter Tested NOS Tightly Matched made in England. These tubes are carefully tested on TV-7/U and bias checker (see the last photo for reference) at well over NOS value (On TV-7 min good is 44=65% and 66-68=100%). They sound wonderful on my Luxman amplifier. Super rare and hard to find now. The price is per quad although there are 6 quads available on request. Please look at the photos carefully before bidding. After paying, I’ll select the best matched quad (basing on mA current) for you. If you want any specific, please mark them from the photos. I am willing to answer any question Return is accepted if you cover the returning fees. Thanks

P/S: The shipping fees in the listing is by regular mail (normally Vietnam post) taking from 12-25 days depending on buyers' local customs. To some regions, it can take even longer than that. Besides, Vietnam post is not always available to some countries in South America, Northern Europe or Africa. Please ask me before paying. If you want to use express shipping services like DHL, Fedex or UPS express taking 3-7 working days, you have to pay an extra of around $60. Please let me know so that I can send you an invoice. If the item(s) purchased may not arrive or be faulty, please don't

hesitate to contact me before opening cases on Ebay. I am more than willing to reach to a solution and make you completely satisfied. Thanks a million