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My 23" Zenith is an F2737E, from 1961 (23ZP4 picture tube). It doesn't have a "peak picture" control that I can see, but it does have a "quad coil" adjustment. To this day I have no idea what that does.
I don't have the schematic for it, but at least now you've got a model number.
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"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
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