These are two pictures of the same tubes. The tube at left is a 5965 rebranded as "12AU7" by International Components Corporation. The acid-etched dot lot markings show it was made by General Electric. It is identical to the GE 5965 pictured next to it. 12AU7 tubes have several different plate configurations, but none are as large as these. It should be suspicious to the buyer that the type number as been removed from the rebranded tube. Some third party military and industrial suppliers like Sperry and Hewlett Packard sometimes removed the original type number to prevent their customers from going to the original supplier. In this case, the original type number was removed simply to fool a prospective buyer. The 5965 is actually a computer-rated 12AV7. The 5965 has twice the gain of a 12AU7, and is not suitable for most applications calling for a 12AU7. Also see our listing of a fake 12AT7, where International Components Corporation rebranded the the same 5965 as a 12AT7