Colorsound Wah wah 1979 help

[garfo]

Hi guys.
Got this wah wah pedal dated from 1979 that it's not working.
It uses two bc184C transistors, for reference, even though I have noticed that on similar circuits (fuzz wah pedal) found on the web, the second transistor is a bc167B.
The pedal has bypass working, when the effect is engaged there is some signal going through but at a very low volume and the pot is doing something but barely and very focused on the lower frequencies.
I have tested the switch and it's fine; wired an external pot to see if the pot was the problem, it is not. Checked if there was voltage going to the circuit from both battery and power supply. Replaced the caps and transistors to no effect.
Also inverted the second gain transistor to match the pinout of a bc167 but the result was exactly the same.

I am wondering if this could be an inductor problem? I don't have a lot of experience with Wah wahs, so, I don't know how to evaluate the inductor.

Hopefully someone could help with this one.