Hi! Attached is a photo - it looks pretty uniform if a touch elliptical
I did another test though - i have a new/unused Ammeter. I wired it up and it showed zero loss of power.
When cutting a circle at 80% power it read 35-40ma for the whole duration of the cut. But sadly the tube seemingly stopped cutting (or marking the MDF) by around 1/3 of the job.
I did other cuts at various powers (15/20/30/40/60) and the Ammeter showed constant power on all of them.
Do you think the assumption then is the tube is the problem and not the PSU?
Thanks for your help btw!