Lincoln Service Parts 1 › Lincoln Electric 9SM12390-21 TRANSFORMER ASBLY M12390-21 Lincoln Electric 9SM12390-21 TRANSFORMER ASBLY M12390-21 Sale Price: $669.47 Original Price: $769.89 TRANSFORMER ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! TRANSFORMER ASBLY PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1