I built my TC-15 almost 9 years ago and the kits just had an eyelet board back then. I looked at my pictures and the ground busses are on the bottom.
Looking at the layout drawing and the photos for this amp, the ground buses are both on the top side of the board, built on the turrets. There are a few jumpers on the bottom for B+. There's a short ground bus for power at the filter capacitor end, followed by a longer ground bus that runs to the other end of the board for everything else. It finishes with a turret that has a wire coming out the bottom that connects to chassis ground.
Check this one very carefully. The soldering looks kind of suspicious in your photos. When you solder to a turret, make sure you get it hot enough so the solder freely flows into the turret's interior. It should fill the turret's hole completely and leave a nice, shiny top when you remove the iron.
And like Darren said, check all your grounds with a multimeter. One probe securely clamped to the chassis and the other on the component's lead before where it's soldered to the turret or ground wire. Measuring just to the solder connection may not reveal a bad solder joint to the component. Also wiggle things around to make sure the reading remains steady.
You should see the same reading you get when you short your two probes directly together - 0 ohms or very, very close to 0 ohms.
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