Arc Machines Inc. (California, USA) has added a number of new features and system upgrades to its Model 307 Tube Welding Power Supply. Its operating system has been upgraded to Windows XP allowing communication with a wide variety of peripheral devices; its RAM has been increased from 64 to 256 MB; added current sloping between levels smoothes out the “steps” seen in critical welds, and slope distance is programmed in actual time or degrees. The Model 307 now operates in 33 pre-programmed languages, and free upgrades are offered for existing Model 307 customers.