Yes, I get sound and I realize I need to clean the contacts.
I'll try adjusting the AGC, and speaking of which, 2 other front access technician controls are "pix lock" and "drive". I'm guessing "drive" is equivalent to the r/g/b drive controls on a color crt but what about "pix lock"?
And this reminds me... it's a shame that user manuals seem to be nonexistent for vintage tv's. Not that it would go into detail on technician controls but still, a manual would be cool to have. I don't know yet what the left outer knob does (inner main knob being power/volume).
Here's a closeup of the tube diagram. I'm not sure which one you're looking at. I see 6AQ5 but the one I'm seeing is for audio (upper right).