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If it is your set and you don't mind a possibly short-lived jury-rig repair you could disconnect the HV winding completely tape up the open leg and connect the remaining two to a SS full wave diode bridge rectifier, or diode/capacitor voltage doubler circuit and hook the plus/minus outputs of that to the field coil input and neg bias resistors respectively...If the primary is already half open there ain't much to lose trying to coax enough B+ out of the good half...
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