RCA 8417 Vacuum Tube High Power Output Tube in generic box. Tube has been tested on a B&K Dyna-jet model 747 tube tester. Tube tests at 55 with 60 beeing the minimum good and 55 being consistent with a questionable tube. Although tube tests in the questionable range for mutual conductance on my tube tester, it does show a lotnof shiny getter remaining and works im circuit when tested on my Bogen MO-100a tube amplifier. Due to the age and the risk of damage due to misuse all vacuum tubes are sold as-is, no returns or refunds.