Acoustic 450

[brianbb]

The photo is not my board. It is a correct circuit board with voltages I found on the web. The controls I was referring to are the double stacked pot for distortion and the one to the left of it which is bass. Of the two resistors between the two caps, I can't read the colors on the left one. The other looks like 47K ohms in the pic, but is in fact 4700.

The missing cap is in the picture to the right of the coil but I can't read the value.

I'll try and trace the circuit to see if they are C111 and R121.

Thanks, Brian

[brianbb]

Well, I found out what happened to the missing resistor and cap. Someone installed them on the back of the PC board. See attached.

I also found several components installed on the back side of the board. Here's a pic of the whole board.

[52 Bill]

I also found several components installed on the back side of the board. Here's a pic of the whole board.

Are the additional parts noted on the schematic? It looks like there is a transistor stage added at the right side of the board.

[brianbb]

Are the additional parts noted on the schematic? It looks like there is a transistor stage added at the right side of the board.

I don't know. I haven't gotten that far. It may take a while to make sense of it. It looks like it has been modified extensively which makes it harder to figure out what is what.