You are bidding for one NOS GEC KT77 OO getter fat Black Base Excellent Testing Values at 56/30 min good (30=65%; 46-48=100%) and at 55mA as shown in the photos. I tested it on my amplifier LUA 4040C with other new tubes and it 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. Return is accepted if you pay for 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