One more PCB, the large white square is an analog delay line used for signal conditioning.
From the numerous adjustable inductors used, this is probably one of the video processing circuit.
What the pots does ( as marked on the PCB ) :
HST
VST
CAR-C SEP
CAR ADD
B-Y Gain
R-Y Gain
Note the metallic "wall" between circuit sections, this is for RF shielding. This is probably one of the Trinicon control electronics board.
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