[MrFixr55]

CORRECTED AGAIN -1/23/26

Hi SlidesK,

Please reread my last post, I modified it AGAIN.  Sorry, at my age (actually a little too early for me). I seem to modify my thoughts, but I did write this in the middle of the night battling insomnia.

Either Pin 1 or pin 8 (likely Pin 1) connects to the plate of the 35Z3 (pin 2) and to the center pin of the indicator lamp socket.  The other heater pin (likely Pin 2) CORRECTION! (LIKELY pIN 8) connects to one of the heater pins of the 50L6 (either pin 2 or pin 7.) 
Attached here are the pinouts for the 35Z3 and the drawing of the power supply (again).

   
   

Please note that the order of pin numbering is from the bottom (worm's eye) view as from the top side (bird's eye) view.
Hope this helps!!