In the attached schematic, when the wiper of VR4 is at one extreme, the resistance to ground is pin 1 = 51k, pin 2 = 51k, pin 3 = 2.6r, and pin 5 = 2.5r, and when the wiper of VR4 is at the other extreme, the resistance to ground is pin 1 = 19k, pin 2 = 43.7k, pin 3 = 19.1k, and pin 5 = 42.8k. What is the value and configuration of VR4? Thanks.

 

OK, I give up. Where's VR4?

 

OK, I give up. Where's VR4?

Bottom center; it's not drawn like a pot...just a rectangle...hence my questions.

 

Are you sure that is a pot? The pin numbering is not standard.

ak

 

Are you sure that is a pot? The pin numbering is not standard.

ak

Yes, I have the actual mixer. The pot is a slider, but doesn't have a part number on it that I can find, so I don't have a datasheet. So, I just drew the pot the same way it is built and numbered the pins arbitrarily, and measured the resistance values with the pot in the circuit.

 

I guess that the connections should looks like this:



Desolder the pot and do the measurements.

 

#Jony130 Thanks much.

 

#Jony130 Thanks much.

I have made the changes you suggested; it certainly looks logical. I have removed the pot and it is marked Alpha A50k, so I am convinced it is a 50k audio taper.

Any other observations or recommendations are welcome. Thanks.