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It looks like a 1971 model B4523DE. Spanish name for the model, I even have the brochure. I have in my attic this same one that my parents bought new. The yellow cataract first appeared in 1982, but now we know it can be dealt with.
This was definitely a value model: 23V CRT, 12 tubes, 14 SS devices in the IF, Y-amps and color IC, A.K.A. the better "Titan 100" chassis (12B14C52) with a barely-wood cabinet of indeterminable style.
Mine needs the VDR replaced in the HV regulator circuit, some blue convergence resistors/pots and some general TLC. It was used regularly for 14 years and repaired only twice before being retired to my old room, then I "rescued it" when the folks moved.
IIRC Zenith had an all-SS chassis this year, 40BC50?
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"When resistors increase in value, they're worthless"
-Dave G
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