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dot = no deflection, vert line = no h deflection, horiz line = no V deflection. Is the 6SL7 red plating? I don't know what those pins are or the schematic for the set, but if they are plate leads and nothing but the resistors are connected it means either the tube is drawing a LOT of plate current, the resistors have gone way above tolerance, or there is a short in the tube or it's socket.
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