[elfiself]

Working on a 42-PT-7. I have some basic questions. Is the chassis connected to power supply common and if so where? I believe it may have been at the riveted connection at one end of the filament resistor. In general, once the common is connected to chassis it becomes the only ground with no other isolated grounds so why do some schematics indicate two different grounds? Is B- always line neutral? how is chassis ground achieved if not connected to line neutral? Is it a matter of being at a lower potential ? And finally, is B+ power supply line in or rectifier DC out or both?
TIA elfiself