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You already know that you could use the tuner subber to feed in signal at V2 pin 2, but it did not work at V1 pin 2.
but I do not think you tried to disconnect L3 point 2 ( leave R37 hooked up) and try to feed it in again at V1 pin 2 with that coil unhooked, you may have to adjust R14 and the gain of the subber.
If it still does not work, the fault is L4, and is likely not passing any signal, out of tune or bad.
If you DO get a picture, the fault is l3 or L1 L2.
Do not worry about the 7v on the grid right now the 6EH7 can still work like that, V2 did just fine with 7v on the grid, V1 will also.
So try it with L3 disconnected while feeding the subber in like you did with V2 and see what happens.
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