That bottom rail is indeed ground, and should be connected to your DC power negative terminal as well as the output jack shield, which will provide your floating DC with an earth ground from the amp. All the connections look right, and component values look reasonable. Your volume pot arrangement will present a variable impedance to the op amp, usually lug 3 is toward the op amp and lug 2 toward the output, but it will work as-is.
Thanks! Well I went back and checked all the connections again and I forgot to ground the portion of the voltage divider! durr
Well now it works! It's much noisier than the battery version (I even did a 1N5817 in-line with the +9V along with other power filtering stuff before the divider). This is even with lars' mod of putting a 10k trimmer between pins 1 and 5 of the 741 :S
Tuning it just so, and cranking the 1M filter pot barely contained the noise, but I found that if I removed the filter pot and popped a 2M2 resistor in its place, it's instantly tame.
Actually playing it a bit more and putting a Bosstone in front of it, I didn't really need the trimmer, but that's a bog standard 741 chip in it.
Apologies for the camera bumping (it was making noise sitting right on top of the input jack on the desktop.
It's overly bassy (no surprise there), but I don't mind it. Needs some tinkering, but thanks, mauman, for remotely spooking my breadboard into cooperating
edit: also excuse my playing—I've never sat down and tried to play that song, and I'm super rusty as it is.
