It's a clone of the Muntz 159 chassis, the only differences are where Bendix out-Muntzed Muntz, the elimination of the coupling cap to the 6AQ5 a prime example. From Rider:
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The DC [from the sync limiter tube] is applied to the picture tube grid simultaneously with the video signal on the cathode. The grid-cathode voltage will maintain black level for a wide range of signals.
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In other words--DC restoration. The retrace mod done to my set removed that connection so I put it back.