You are bidding for One Pair 12AY7/6072 Black Box plate, Used, Tested Excellent made in USA . The tubes are super rare, hard to find. Return is not accepted due to vintage tubes. All the tubes are carefully tested on my tube tester AVO CT160 at the good range with no short and no gas (see the last photo). I cannot guarantee how they are tested on other tube testers except for Avo 160. I also don’t have an amplifier which runs on these tubes so I cannot guarantee how the tubes function on your amplifier or your system. There are 2 pairs available. Please choose the pair you like in the last photo. Thanks

Testing values on Avo CT160

Ia: 3mA (100%)

Gm: 1.7mA/V (100%)

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