Yes, I see now.
From the voltage drop (across the 2K2) you had with the 741's, assuming you are again at 22V with the 820R, you have increased from 8mA to 22mA.
So there is no defect, just an imperfect part substitution. TL071 would have been a direct drop-in replacement with no mods.
From the voltage drop (across the 2K2) you had with the 741's, assuming you are again at 22V with the 820R, you have increased from 8mA to 22mA.
So there is no defect, just an imperfect part substitution. TL071 would have been a direct drop-in replacement with no mods.