lumberbunny

I'm having a hell of a time figuring out which part is the audio amp. There's a 741 op amp on the board, and I gave that a tap but nothing happened. Have any hints?

Recently I found an entire Jack the Giantkiller cabinet. I'm new to these things so I was hoping to get some help on repairs. It's biggest problem is that the sound doesn't work. I've tried the obvious like turning up the volume and making sure the speaker still works (it does) but beyond that, my knowledge is pretty limited. Does anyone have any suggestions as to where to look next? Thanks