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If you look at the GND alligator clip going out to the probe, and the shield for the audio in and the scope out, all those on the schematic connect back to the signal ground/ AC line neutral and not The chassis ground. Since you didn't actually use a grounded power cord and went to the trouble of using a heyco strain relief clip it looked permanent to me. If the GND clip was capacitor isolated like in the vintage designs this would obviously not be a point for discussion.
I never intended to sound argumentive and I apologize if this has gone in that sort of a direction. The only reason I even brought it up, is I once decided to use a polarized cord and not bother with isolating the chassis on a phono amp to get rid of hum, and ended up giving myself a huge shock with a miswired extension cord.
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