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Haven't fired it up, but I noticed that the little red circuit breaker is missing on the board, so it doesn't look like it'll do anything until I get one, or bypass it with a simple inline fuse. No biggie.
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That model may not have a little red circuit breaker IIRC. While several of Zenith's color chassis used a circuit breaker in the power transformer's 140VAC secondary circuit, other versions of the same chassis used a small plastic plug-in "Belfuse" unit instead. The schematics typically show both versions, with the circuit breaker in solid lines with an "x" across them and 3A fuse indicated by dashed lines. The Belfuse is usually located on top of the chassis between the power transformer and the "Y-Amp" tube. The Belfuse was a neat, brightly-colored thing that used the heating effect of the current through the fuse element to ignite a tiny explosive charge and literally blow it open in the event of an overload. The color of the fuse unit and its socket identified the rating of the fuse.
My memory wasn't perfect with regards to identifying the chassis from the photos. Further research indicates that it's probably a 24-tube chassis, perhaps a 24NC31. The back photo looks like the 24MC32 from the chassis layout and HV cage design. The front looks more like a 26KC20 from the black control door across the bottom edge of the cabinet instead of the 24MC32's characteristic small brushed aluminum door under the speaker. I seem to remember that the 24NC31 had the wide control door. HV cages of the 25NC33 and 26KC20 and other models were oriented differently. The upright cage with the 6BK4 located outside the main cage area in that separate shield box was common on the 24-tube chassis.