Lincoln Service Parts 1 › Lincoln Electric 9SM6790-100 TRANSFORMER & THERMOSTAT ASBLY AC-1500 M6790-100 Lincoln Electric 9SM6790-100 TRANSFORMER & THERMOSTAT ASBLY AC-1500 M6790-100 Sale Price: $625.21 Original Price: $718.99 TRANSFORMER & THERMOSTAT ASBLY AC-1500 PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! TRANSFORMER & THERMOSTAT ASBLY AC-1500 PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1