It's LM108 and LM112 (internally compensated) and there is admittedly no trick there. It's got 1nA enter bias which is rather stable with temperature as for most bipolar opamps since β actually improves with temperature. Later on iterations like LT1008/LT1012 or OP97 pushed it right down to Asides from its https://irvingt260hra2.actoblog.com/profile