OpAmp Upgrades in CD 880…..?

Checking THD+noise of an CD880 OpAmp upgrade to OP215. 🙁

• Red – OP215
• Blue – LM49720
• Green – NE5532

Multitone -20 dBfs OP215 vs 5532 – 20 Hz -20000 Hz

• Blue – NE5532
• Red – OP215

Multitone -20 dBfs OP215 vs 5532 – 20 Hz -20000 Hz zoom to noise floor

• Blue – NE5532
• Red – OP215

Multitone -20 dBfs OP215 vs 5532 – 1000 Hz -20000 Hz zoom to noise floor

Tested some more

Multitone -20 dBfs 20 Hz – 22 kHz

Multitone -20 dBfs 1 kHz to 22 kHz zoom in.