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At this stage I would try to determine whether the 1B3 filament is lighting. In a darkened room, looking upward from the underside of the tube, the filament should be visible glowing a ruddy orange. If it isn't, one of the filament pins may not be making connection in the socket.
Another possibility - the 1B3 may be gassy. Is there a hazy blue glow filling most of the tube? Does it feel hot to the touch after running a few minutes?
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