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If anything Doug should know as he has got all the Zenith manuals covering the time frame of the set in question.
I thought they were still using mostly an all tube (More than 4 tubes) chassis but also using a solid state board assy that was fixed to the chassis.
The all solid state chassis would be more in line with the use of Chroma color CRT's in around '71-'72.
Although I have seen a similar knob config used in a 1968 model before they went for the single knob VHF/UHF tuner arrangement.
Last edited by daro; 11-23-2009 at 04:31 AM.
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