I agree with Andy.
The soldering side really needs to be cleaned. I would pass the iron between almost every solder joints to clean the spaces between them. Better to do some quick moves to avoid overheating the pcb (no more than 2 or 3 seconds, even less if you can, and sometimes let the pcb cool down several seconds before coming back with your iron).
You should move the iron even more quickly around transistors because they are very heat-sensitive. If the pcb gets blackened by the heat, your iron is too hot.
After that you can softly use an old and clean toothbrush on the soldering side, to gently give a final cleaning touch.
Some wires seem to be quite burned. If you have no change once you cleaned the pcb, next step should be replacing those with fresh ones. Jacks wiring seems ok, but wires are sligtly burnt too, that would make me uncomfortable, or even suspicious

.
Are you sure the germanium diodes's orientation is correct ? I had some trouble in the past with these and their unusual markings.
Finally, something should be used to prevent the pots from shorting the soldering side of the pcb, once everything is in the enclosure. Plastic tape is ok : just put some tape at the back of the pots located near the pcb : Nothing can touch your pots, not even an other pot.