I think Carl Tunnicliffe put a curse on me
The other week when he mentioned his laser tube had blown and I commiserated. Well cutting last night my laser beam got weaker and weaker, no the CO2 tube was fine.
The flyback transformer in the power supply unit that generates the 50.000v (50kV) to charge the laser tube has given up the ghost. A new transformer is only £19 but just my luck nobody has one, leaving me to purchase a full power supply unit for 60 quid