Presume you mean an RCA signal generator type WA-44C.
If all you get on the output connector is 120 Hz hum,
that points to a bad electrolytic capacitor in the power supply.

Look for large tubular capacitors with ratings like 10uF or 20uF 250V
connected to the rectifiers.

If you put a digital multimeter across them, you should only read
a fraction of a volt on the a.c. volt scale,
and maybe 150V on the d.c. volt scale. If you read a high a.c. volt
value, the capacitor has dried out, and no longer works.
They are easy to replace.

73,
Ed Knobloch

Crescendo wrote:
I have an old WA-44C and I was going to use it for one of my science
projects. The problem is that when I connected my speaker coil to the
line frequency connectors and tried to change the frequency and such,
nothing changed. I tried every knob on it and nothing change at all,
the only thing that worked was the line frequency power output allowing
me to only increase the volume.

I was hoping that some of you might know how i might be able to fix
this.

If you are able to please help me. Thank you.