The tube is not tested and is being sold As Is in the condition it is pictured.
Item Tag: 2531
-
Beckman 2531 Vacuum Tube Untested Multivibrator?? NOS +Box
Item is one Beckman 2531 vacuum tube in its original box. My vacuum tube tester does not support this type of tube. Photos are of the actual item for sale, or if more than one is available, representative of any of them.