flash tube malfunction determination

timekeeper3

Prominent
Apr 7, 2017
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Nikon SB800 made a popping sound ( like in capacitor) the unit powers up, the display lights up, and it sounds like the cap is charging, but the flash no longer emits light. I would like to make sure that it is for sure the flash tube before removing it. Does anyone know if there is a solid fillament in the tube or is there a gap?
Any help greatly appreciated and or other ideas.


Thanks

timekeeper3