I keep getting oscillation / uncontrollable noise with the following circuit. My input is a balanced audio signal which goes through a TL082 op amp configured as a differential amp. The output of the op amp feeds an STA540 power amp IC. What's frustrating is if I use either circuit independent of the other, I have no issues. I get a great, clean signal through headphones at the output of the op amp, and I get great, clean signal if I feed it directly into the STA540 and bypass the op amp. BTW - the balanced inputs arrive at the op amp decoupled. The output of the previous stage (not shown) already has decoupling capacitors.
I'm stumped. Any help is appreciated.