Hi
I am nearing completion of my laser engraver build, Installed a Reci Z4 100W tube, aligned mirrors and did a few test cuts on some MDF at 50% power, amp meter reading about 12ma. Everything seemed to be working perfectly I was a very happy man, gave myself a pat on the back for a job well done and shut down for the day. Next day fired the machine up again, excited to run more tests but to my horror, when I fire the laser I hear a sort of sizzling sound from the + side of the tube and the laser doesn't fire, no reading on the amp meter.

Please help