Ping troubleshooting

[LateCentury]

I tried that. It didn't work at all, didn't even power on. Maybe my drawing was wrong.

I flipped the regulator and got almost the exact same readings. Still did not pass a signal when switched on. Only a very faint one that I could hear once I cranked up the volume on the amp. I could even hear some self-oscillation when the pots were both at max. In the process I broke a leg on the REG, so I might as well socket a new one in this time. 

[LateCentury]

Got a new transistor and a new IC and it works! I needed up trying 4 different TL072's before I found one that worked. Now to finish the enclosure and box this up... Thank god the problem wasn't some other hard to remove component.

[Leevibe]

Congrats! Good job sticking with it. How does it sound??? I have to say, it seems a little suspect to have that many TL072s be bad. Curious where you sourced them. Hopefully it's just a bad run of parts and not an intermittent problem that will resurface. Anyway, at least you know it works. That's awesome. I need to put in a SB order so I can start rocking some of these 1590g's.

[LateCentury]

I'm not 100% sure it wasn't a bad or damaged transistor either. It sounds good! There is a little self oscillation when both pots are cranked, and i kind of wish there was more. But its good the way it is. crossing my fingers nothing breaks after I box it up...