Tube Investments has reported a huge jump in net profit to Rs 8.38 crore (Rs 1.66 crore) for the first quarter of the current fiscal. Sales income is higher at Rs 201.63 crore (Rs 149.67 crore), while interest outgo is lower at Rs 4.62 crore (Rs 5.82 crore). Gross profit after interest but before tax and depreciation takes up Rs 6.03 crore.