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Try this:
Push the mixer osc tube shield all the way down, get an old tube shield and stick it over the uncovered part of the tube not allowing it to ground out. The ribbed split shields work best. Connect the yellow lead to the ungrounded shield and the black to ground.
Balance the tuner between two channels.
See what you get.
I wonder if this could be a tuner problem, the middle image doesn't look that bad. The mixer plate coil has a huge effect on the curve and it would almost be nice to unplug the tuner and inject directly into the IF. Just to eliminate the tuner.
Play with the bias voltage, dont go off what the sams says.
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