[RodB]

Dan, the AVC is generally sourced from the detector. So, if you look at the diagram above for the detector diode connected to the second IF secondary winding then down to the volume control there's a 2 meg resistor (#26) going to the left that feeds the signal grids of the IF and RF tubes. That's the AVC, which will be a negative 2-3 volts with low or no signal input and up to 10-15 volts when a station is tuned in. At the top of the volume control where the 2 meg resistor connects you should see this voltage vary with the strength of the rf signal. If you measure the other side of the resistor the meter will load the circuit and give you a false reading.