Motorola ts907 low hv

[timmy]

2 new old stock tubes for video IF both don’t even read on the tester I still have low hv I don’t think these 2 tubes have anything to do with hv. If I turn the horizontal frequency which is also the horizontal hold in about 5 turns the screen fills and I get good hv but the slug is halfway out of the coil not sure that is correct. I’m lost at this point.

[zeno]

Originally Posted by timmy

2 new old stock tubes for video IF both don’t even read on the tester I still have low hv I don’t think these 2 tubes have anything to do with hv. If I turn the horizontal frequency which is also the horizontal hold in about 5 turns the screen fills and I get good hv but the slug is halfway out of the coil not sure that is correct. I’m lost at this point.

Keep it painless first. Change hoz osc tube ( 6BL8 ? ) first.
If slug is way out but HV OK the hoz osc is way off the norm. Recheck caps
& VALUES used. In theory at this point the sweep is giving full width & HV
Try hooking up a source & look for clues. Hoz AFC can be defeated by grounding it out at the right point & will give a "floating" pix. I dont
have schematic so cant say exactly where. Never seen H AFC or the feedback from the FBT cause this prob. BUT ??

BTW if this set uses 6BL8's or 8BL8's just swap them out to test.
It was Motos 6GH8 but a better tube.

73 Zeno
LFOD !

[damen]

Horizontal drive circuit