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I think I know exactly what cabinet style you have and Zenith used many different chassis versions in that cabinet. It started off with the CCII, 1st generation System 3, 2nd generation system 3, and the 3rd generation system 3.
The first generation system 3's are from '78-early '79 and use a big power transformer in the power supply. The modules are 9-151, 9-152, 9-153, etc.
The second generation system 3's are from around '79-'82 and used the 9-160 power supply/horizontal sweep module. There is no power transformer in this chassis. The rest of the modules were the same as the first generation.
The third generation system 3's were made between around '82-'86 and used the 9-181 main module and a 9-186 horizontal sweep/HV module.
These sets came in remote and non remote versions with single knob tuning, varactor tuning, or digital cable ready tuning.
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