Question : The 1458 (or 5558) chip contains two 741 in a 8 pin DIL. I've been told that the TL 071 is a good replacement for the 741. Is there a chip that contains 2 x TL 071 with the same pin out as the 1458 ? Is it the TL 072 ? (the TL 074 contains 4 x TL 071). jbv