Laser tube flickering - any input appreciated!

[iainog44]

Hi all,
I have noticed an intermittent loss of power that coincides with the laser beam flickering at the end of the the tube - see video attached. I have checked for arcing but have not noticed any. Has anyone seen this before? Is my tube done for?
Thanks in advance,

https://www.dropbox.com/s/8lvmd5th78...15852.wmv?dl=0

Iain

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