Tags : :
I have a mic pre I built from a kit that's misbehaving. The gain goes up til the knob is halfway, then the distortion goes up but no more gain. I assume it's something with an active device, and I really haven't had time to look carefully. The one thing I did notice is that, when I run a 1 kHz tone through it, the voltage of the negative signal at pin three on the output is double what the voltage of the positive signal is. This is a Class A device - shouldn't the voltages be the same? Am I jumping to an unwarranted conclusion? Thanks.