This is for one 6MK8A vacuum tube without a box- tubes were acquired in a large lot.  The tube type and brand may have worn off the tubes.  All tubes here were tested with a B&K Dynascan 667 tube tester and tested good.

Item used, sold as-is.

 
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*** A note about my tubes: Most of the tubes I sell are used and have not been tested for "remaining useful life" (if there even is a reliable way to do this).  Know that all tubes I sell are tested as completely as possible to insure they will work for you in your projects and I often use them in mine without problems.  If you want something new or close to new then finding a NOS/NIB item will serve you better.  I just want you to be satisfied with your purchase.