You are bidding for a quad GEC/Genalex Gold Lion KT77 OO getter Black Base Excellent Testing Values at 44-48-54-56/30 min good (30=65%; 46-48=100%) and 53mA-41mA-50mA-54mA as shown in the last photos. I tested them on my amplifier LUA 4040C and they functioned flawlessly. Please remember that KT77 (6.3V-1.4mA) is not quite similar to EL34 (6.3V-1.5mA) so be careful with bias setting. I am not responsible for any wrongdoings or inproper equipment which may cause damage to the tubes. Super rare and hard to find now. What you see is what you get. Please look at the photos carefully before bidding. I am willing to answer any question Selling as is due to vintage tubes. No return. 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