A matched pair of NOS Raytheon 5687 tubes black plate type, O-Getter.  These are from original stocks supplied for special quality computer grade tube replacements.  They were most likely made for the computers of the late 50's and early 60's.  These are all from the same lot and all date matched, batch matched and all from the same factory production lot.  These are some of the only remaining examples of the one of the finest 5687 tubes made.   All tubes test new on the IBM 5687 bulk tube tester from the same era.  They are all excellent A++ quality examples.   We guarantee all of our tubes to perform and are exactly as described.

Please let us know if you have any questions, and good luck.