IR Twin-Tube Replacement Lamp. BT SM 102-SW-A1 Type A, short wave, Press build before 1997 $555.00 BT SM 102-MW-B Type B, medium wave, Press build before 1997 $555.00 BT SM 102-FMW-B-3000 Type B, medium wave, Press build after 1997 $555.00 BT SM 102-SW-N1 Type H, short wave, Press build after 1997 $555.00 BT SM 102-FMW-B Type B, medium wave, Press build after 1997 $555.00