You are bidding for 4x Mullard EL37 Double Pan getter, tested excellent Matched Quad Vintage Tube made in Great Britain. These tubes are carefully tested on my TV-7/U at 48-50-44-50/25 min good (max 38-40) and on bias checker at the same time at 40mA-42mA-44mA-44mA with NOS at 35mA. They sound wonderful in my hifi system. Super rare and hard to find now. What you see is what you get. Return is accepted if you pay 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