Tube investments has reported a 23 per cent rise in its topline at Rs. 721 crore during the second quarter ended September 30, 2010 against Rs.586 crore in the same period in the previous year. The profit before depreciation, interest and exceptional items was at Rs. 82 crore against Rs. 64 crore. The net profit after taxation for the quarter was at Rs. 31 crore against Rs. 7 crore. The net profit of the corresponding previous year was after providing for Rs 30 crore towards diminution in value of investments, says a company release.