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The Zenith looks a bit brighter but I agree your issue may be in the video output stage, which affects the contrast. If you start by replacing paper coupling caps and any electrolytics through the 1st and second video stages, it can only improve. Need a schematic?
Years ago I worked on enough Zenith consoles from this era to know they can have a moderate issue and still look close to normal. Ill check my notes in the "TAB" color TV service manual for Zenith.
After all, Zenith used to advertise extra components were used that other manufacturers (think GE here) did not include. The downside of all those parts is that when one would fail, it was not any thing resembling a common symptom. Open electrolytics could present in some very strange ways.
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"When resistors increase in value, they're worthless"
-Dave G
Last edited by DavGoodlin; 01-30-2017 at 03:30 PM.
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