No vertical on B&K 1077B TV Analyst

[bandersen]

I picked up a 1077B a couple months ago. It's in great shape except for one problem - no vertical on the internal test pattern CRT - just a horizontal purple line !

I've checked the B+, 13GF7 vertical output tube, vertical transformer and they seem fine. So are the signals on my scope as compared to the service manual. I unsoldered one end of the vertical yoke winding and got about 1,300 ohms. I think that's about right since there are two 560 ohm resistors shown in the schematic in the yoke windings.

Anyone have an idea? This is driving me nuts!

Thanks.