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Only instructions for 1B3 are, "Glows at 2, 7. Press to 'S'. OK over 18." General instructions are, "The N-S slide switch is normally kept in the 'N' position unless the tube chart indicates otherwise." The tube chart is a 1977 reprint. Maybe it was never updated for this tube because most users would recognize and understand the difference in the newer tubes. Thanks.
-Winky
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