[Chas]

It has been so long ago that I serviced a chassis and turned it over to have some of the electrolyte actually run out of the condensers... Yeech...

There was only the smallest standardization of symbols used in schematics. Often a radio brand could be recognized by seeing just a portion of the schematic. RCA had some quirks in early battery sets in using a diagrammatic, then using fillets on lines followed by tube elements numbered within a circle. Tuning condensers often indicating the rotor.

The practice of introducing new symbols as electronics evolved has become more common. Ideally, a "device" schematic should follow a flow of some sort.

For "our" radios signal left to right, impedance high at top and low at bottom of active devices and support (power) feeds under active devices, power sources some lower left some in the lower middle most in lower right.

All that is often confusing when trying to follow signal paths in a diagrammatic, that, is the pictorial of the schematic represented by actual component placement.

In a very recent post in ARF was of a convoluted PA and power supply. More like a corn maze...

https://www.antiqueradios.com/forums/vie...6&t=432631