If you get the "Sorry, the file cannot be displayed. There seems to be a technical issue ..." error when trying to view an image, a workaround is to click on the cog icon in the upper right side of the media viewer, and then select "Disable Media Viewer". We are aware of the problem and are looking for a solution.


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The T55 is a CRT used in the 515 and 515A.


  • accelerating potential: 4000 V
  • vertical deflection factor: 5 V/cm
  • horizontal deflection factor: 20 V/cm

Part numbers

Part No Name Phosphor
154-0344-00 (154-344) T55 P31 P31