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James, the only difference between the 441 and 525 line standards is the horizontal scanning frequency, and all the sets have plenty of range on the controls to adjust to either. So no modification is needed.
This set was made for 2+ years and there are several versions. Some used 6V6s and some used 6AG7s as video outputs. Some had 2 channel tuners and some had 3.
Dave's set may be missing its tuner, since the shaft is gone.
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