K5300 Strobe Tube Anode Identification

Hi. The U-shaped strobe tube included in the Stroboscope kit (K5300) doesn’t appear to have any markings (red strip, dot, etc) to identify the anode. It looks alot like the one in the image below from http://xenonflashtubes.com/strobe-u.html. Any ideas? Thanks in advance.

Basically, there is a 50% chance it will work immediately.
There is no risk in harming the device when it is inserted the wrong way round, but keep in mind that the caps will remain charged if the bulb has not flashed !

Thanks for the tip about the caps, VEL417! I got lucky and guessed right the first time. There’s a U-shaped metal band along one side of the tube and I soldered it in so that it matched the image on the K5300 box (band side facing in). May or may not have anything to do with it, but who knows? Thanks again.