[Heatercathodeshort]

I don't think a resistor will work. You need an inductance, a coil. The actual resistance of the winding is not too critical for test purposes. Try connecting the frame coils in place of the line leaving all connections to the frame output disconnected.
Resistance readings taken against the service manual can be misleading. They were often calculated from old style meters such as the AVO 7. J.