You are bidding for One pair Mullard 12AX7/ECC83 1957 code mC1 B7 Square getter Excellent testing values made Britain and are tested NOS on my Avo CT160 at 1.4mA-1.5mA and 1.4mA-1.4mA (NOS is 1.2mA), tightly balanced and sound wonderful in my hifi system. I am using Avo ct160 because it is more reliable than any other tube testers I have. Tube testers are different so I cannot guarantee except for Avo CT160. What you see is what you get. Sold as is. Return is accepted if you pay the return shipping fees. Please ask me anything if unsure. Please read the description carefully before buying. 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 $68.75. (For order over $1000, Express shipping service is a must. Please wait for the invoice to pay). Please let me know so that I can send you an invoice. If the item(s) purchased may not arrive or faulty, please don't hesitate to contact me before opening cases on ebay. I am willing to reach to a solution and make you completely satisfied. Thanks a million