This is for one 21KA6 vacuum tube without a box- tubes were acquired in a large lot.
The Brand name may have worn off the tube(s).
Tubes listed here were tested with a B&K 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.