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Yes for the G2 question..
It really is hard to tell from the pictures you've attached, but in the first one,the board in the middle of the picture may have the screen and focus controls, but can't be certain. Each control will effect the individual crt.The green is always in the middle. Can you read any of the names of the controls?
From the picture you have firing onto the wall, it certainly looks like the green and blue guns are weak. If you want, try cutting out of cardboard a circle large enough to cover the face of the lenses.You only need 2 pieces. Then, cover two of the 3 lenses and see how much light you get.It's best to do in a really dark room.That projector uses 7" tubes and aren't very bright to begin with.
If AVS is of no help, you could always go the Curt Palme's web site and shoot him an email regarding the crt's...You'll need the model number of the Zenith you have and he may be able to cross reference it to replacement crt's...to be totally honest, you will most likely be looking at 3,given the fact they all are dim.This will give you an idea as to the costs you're up against. You also may have drive board issues, as has been suggested.
If you find the G2 controls, be cautious.Cranking them up can wipe out a crt.These are the controls that apply specific voltages to the crts.
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