Balance pot question....

[analog addict]

I have a Mathis console amp that I have almost finished restoring, but there seems to be a slight problem in the controls. When the volume is turned all the way down, all of a sudden the volume jumps up on one of the channels. I've checked the volume pot, but both channels measure equally....:scratch2:

The other problem is that the balance pot seemed to be have to be turned way to one side to get balanced sound. I measured the pot and this is what I found....

The left, middle or right denotes the position of the knob on the balance pot with the rest of the information being the resistance measurments. Can I safely assume that this pot is toast? If so, what value of pot do I need for replacement? Unfortunately, I haven't been able to find a schematic on this amp.....:sigh:

 

[Jon_Logan]

I think that volume pot is measuring correctly. It's probably a logarithmic or audio taper. It shouldn't have a linear resistance plot. It sounds like maybe a crack on the resistor track, or the wiper might be doing something wierd at full attenuation position.

 

[Jon_Logan]

I think that volume pot is measuring correctly. It's probably a logarithmic or audio taper. It shouldn't have a linear resistance plot. It sounds like maybe a crack on the resistor track, or the wiper might be doing something wierd at full attenuation position.

...are there two or 1 balance pot? If there's one, it sounds like it was replaced with the wrong type of pot. If there's two, it might be normal.

 

[Tube Radio]

If not already done clean the controls with sone Deoxit.

 

[analog addict]

...are there two or 1 balance pot? If there's one, it sounds like it was replaced with the wrong type of pot. If there's two, it might be normal.

It's a single pot. The volume control is a double pot. I will de-oxit again....:scratch2: