You are buying 4 used tubes, known in the jukebox community as "6973-sub" tubes, designation "6 EM5", very good quality, electrically closely matched for cathode current.

We have more than one quad available, so tubes will vary in appearance.  Buy as many quads as you need!  This is a great price for electrically matched quad of output tubes for your jukebox.

"6973-sub" means that these tubes will work in-place-of original 6973 tubes in your jukebox amp that uses 6973 tubes, as long as you jumper together "pins 1 and 8" underneath each 6973 tube socket.  

If you make that VERY easy mod, you can use these tubes and still use original 6973 if you want someday.  If you are not comfortable doing this mod yourself, any respectable amp technician will be glad to do this for you. 

Why you want these tubes:

Of course, your amp must be properly rebuilt by a technician before ANY tubes will "work" in your amp.  Therefore, if your amp has not been serviced and you expect tubes to "fix the problem", then please understand that "it doesn't work that way."

High quality tubes that will perform good and have been tested strong in professionally calibrated B&K 707 mutual conductance tube tester, and without shorts or leakage.