I would suggest that as it died when you tweakd a pot, the pot may well be duff? - old pots not only tend to go faulty, they also get very fragile, and it may have broken when you adjusted it.
But the circuit is simple enough, a free running wein oscillator (RHS) and an invert (LHS) - both have a simple pair of transistors to increase their current sourcing capacity.
The 500 ohm pots set the gain of each stage, set the oscillator one first, so the output is high but below clipping (unless you can find proper setting instructions?). Set the inverting amplifier one to give the same size output.
If the amplifier feedback pot is maladjusted, the oscilaltor won't run at all, so it could that that's faulty.