[jerryhawthorne]

We might need a picture of your sig gen. Mine, a simple one, has a coaxial cable attached to the front. This cable ends with a couple alligator clips. The center of the coax is the RF signal, the shield goes to ground on the chassis. As for your modulation control, yes, set on the Internal position. In this position the internal (inside the generator) tone oscillator is used to modulate your RF selected. I suspect the ground is not necessary unless you are using just the tone (AF) output of the generator to troubleshoot the amplifier (audio) part of the radio. It appears that you have pretty much tested everything out from the 6A7 to the speaker! That would be the IF section, second detector and audio. The first dectector 78 is also known as the mixer involves the oscillator as part of it. Too early to tell, check your antenna hook up.
Jerry