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Originally Posted by Mick
Is this any help? it sounds possibly related.
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I was actually just looking at that video. And I noticed these resistors looks to be the same between the Rev 1.1 and 2D boards. 1.5K and the same he has on his 1A board in the video. which he changes to bigger one. But on the 2D board I have no distortion.
What I could try is to put the original op amp back into the 1.1 board then inrease these two resistors. But very strange both rev 1.5 and 2b/d boards have these exact same value resistors.
Also, very strange how the op amps between Rev 1.1 and 2D doesn't seem to be interchangeable.
Edit: So put back the original op amp in the Rev 1.1 board and now I measure the same symptoms I did with the op amp from rev 2D board. Missing the +12v and negative voltages on all legs. Sound is low and distorted.