Glad to see some op-amp rolling going on! Awesome!
Do you have a 200 MHz Oscilloscope handy or can you borrow one?
The reason I ask is that many times when you roll op-amps you can create a low level high frequency oscillation that’s not detectable by ear or with audio measurement equipment. This is true even for unity gain stable op-amps. It definitely impacts the sound in a lot of unpredictable ways.
Checking to see if your ‘roll’ is clean is an important step in the process.
Tom
P.S. I’m an analog/RF design engineer .
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