Which of these tubes is more compatible with a K7000 chassis

could it be the tube? I might try one of the other ones if there isn't some adjustment i am missing
 
No. Composite sync should be fed to the 9th pin, the last in the row.

Red
Green
Blue
Vid Gnd (also below)
Pos V sync
Pos H sync

Vid Gnd
Neg V sync
Neg H sync <--- Composite sync, or combined sync, goes HERE

Thats how I have mine hooked up, except I don't have a video ground beside the neg V sync slot
 
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