[jerryhawthorne]

Well, kept my sig generator as low as possible and injected a 100KC signal with modulation into the antenna lug and "g" does nothing to the output (tone level sound) out of the speaker which is strong at max volume.
Not understanding how a signal (a tone AF) which I believe is going into that section is going to somehow alter the tuning of the radio I'm a bit stumped. A brief explanation of how it works would be helpful for troubleshooting it. I will check tube voltages tonight but would be nice to also use my scope to look at what is happening. I just don't know what is suppose to happen. There must be some feedback from the mag tuner to something. I just don't know what to look for. Any help please? I need a rough theory of operation of the circuit focused for the dummies.

Jerry