Stage right 5W tube amp lights but no sound

Got this for free and want to see if I can get it working. Never worked on a tube amp only solid state and a Marshall Valvestate amp

Stage right 5w tube amp at first no lights.

Replaced fuse and it powered on but no sound.

Removed the power tube and didn’t realize the previous owner broke the alignment tabs off and I may have misaligned it when I put it in and there was a little smoke on the side behind the power switch but light stayed on and caused a humming sound.

Removed power tube and aligned it properly and replaced the pre amp tube with a known working one and still no output and no humming.

Next ideas Check cold solder joints on the board and the input jack. Try a known working power tube.

Looking for suggestions on best ways to troubleshoot and where to look next