RECI Laser tube problem

I have a problem with a Reci S6 CO2 tube. The old power supply died so I've got a new one with a mA readout. The tube is lasing but the beam at the anode seems to start at the end of the coil (ie off to one side). The plasma gets straightened out by the tube but it seems to hit the guide tube at the cathode end as well unless I crank up the current.

Any suggestions about how I've badly wired it all back up gratefully received.

Lomax