That's why a simple test with a DMM would reveal if we're looking in the right direction with our troubleshooting. But of onionhead noticed some attenuation, I'm pretty sure we are. Let's see what he answers.
I also have created mine AB tester, but used relays, and a RaspberryPi controlls them. I have written a simple Python program for that.
This approach is better for me, because I can switch from the listening position.
Honestly have no idea as I pulled this from various electronics devices. A friend told me he thought it was a Shallco. Not sure if pic helps buy here it is. I'll post results of resistance values in a few days time.
