Schematic Questions

[cdmarion]

Hi everyone, I'm working on a Stewart Warner Model 9104B, Sams #Set 105-Folder 10.

I've got three tubes, V9-6au6- AGC Keying, V16-12au7-Sync Clipper and V18-6al5- H AFC- All three tubes are not getting hot, the heaters do not apear to be working.

When I look at the schematic, at the tube heaters it shows one pin grounded and the other has a arrow pointing to an X. This is my first question, what does the X refer to and how do I trace the heater circuit when it's not traced out on the schematic? I know I'm missing something really simple here.


Any thoughts?