Three GE 5R4GYB vacuum tubes with matching date codes and markings. Black base and side O getter. Matching Date Codes NY (Oct. 1968) with boxes. All the tubes test new ratings on B&K 707.  (see photos for full details)

(Tube 1) GE 5R4GYB Date Code NY (Oct. 1968) with box. Tests NOS ratings on B&K 707.

(Tube 2) GE 5R4GYB Date Code NY (Oct. 1968) with box. Tests NOS ratings on B&K 707.

(Tube 3) GE 5R4GYB Date Code NY (Oct. 1968) with box. Tests NOS ratings on B&K 707.

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