[chalupa13]

I'm currently restoring Philco Lowboy 111. I am having difficulty comprehending this schematic, particularly rectifier and plate voltages. It seems to me that -VDC is fed from the center tap of the transformer into the field coil and then connects directly to the +VDC line coming from the rectifier tube. Also, it looks like -VDC goes to all tube plates and I'm not sure how that works. I marked the negative in yellow and positive in red. Could someone tell me what am I missing here? Thank you.