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Also, be on the safe side and change those white capacitors in the high voltage stage. They regulate the high voltage and when enough of them fail the neck gets cracked by too much high voltage. A warning of this coming is the set develops a width problem and the turn on "crackle" gets very pronounced. Try to get the original Zenith replacements. I can't figure why the focus affects brightness, unless the control was hooked up wrong in the past or possibly the CRT socket has some corrosion on the focus pin to the spark gaps in the socket. Be careful moving the tuner assembly around. If I remember right that set uses an incandescent based optocoupler to turn on the triac in the remote circuit and age makes it fragile and the set will go dead when it fails.
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