I have several old transformer style welders. One is an old P&H Chemetron ac/dc 300 HF. It has a spot for a “electronic timed weld unit” according to the label on the machine face. Am I correct in assuming this would be a primitive pulse unit? Is anybody familiar with the old Chemetron welders. ...

Hello from IL. I have not welded in a long time but had done a lot of mig in a previous job. I have old school transformer machines I have picked up here and there. Getting close to retirement and am wanting to get back into metal fab.