My Lincoln 225 amp tombstone is over 30 years old. Can't say about the core but it does in fact have a cooling fan. I used to run it on a 220v dryer circuit (30 amp?) I have since installed a dedicated 50 amp breaker for my shop. Since I no longer have to run 120 feet of extension cable to the dryer outlet, I believe the welder actually performs better not to mention the added safety
