Have a dialarc HF and the other day I went to go buy a Mic 4 interface control so I could use some 5 pin foot control and finger controls that I have and the guy had pulse control sitting there. Looks much like the PC 300 that I've seen before but older looking and with the 5 pin in and out. It was an estate sale and the guy didn't know much about it I took a chance and grabed it. I'm not sure if its just not meant for the old dialarc or if its not working. Mic 4 is working fine. With pulse hooked up to mic4 and on welder it act the same with no change. Checked the basics on/off switch and power going to and out of transformer seems ok. Any ideas??image.jpg