i am using proteus 8.0..to simmulate wien bridge oscillator which works fine with LM741 ic but when i exchange it with UA 741 it dosent work..what might be the problem?
properties for lm741 show spice model...but for it shows ua741 LISA modle file..

 

You can get a uA741 spice model from http://www.ece.utah.edu/~ccharles/ece3110/Labs/spice_models.html