Hi Bob - welcome to VideoKarma.
Here's a
scan of the 1077B parts list and schematic.
I've got of couple of these guys. One was DOA and I haven't had the time to repair it. The other I picked up along with a Predicta Princess coincidentally. I had broken leads on the vertical yoke windings. A pain to repair, but it's been running fine ever since.
Good luck getting it and the Predicta working.