Dumont RA-109A help needed - very little high voltage

[Zenith26kc20]

remove the caps from the 1X2 tubes. One of them will have the RF from the sweep circuit on it. Using a well(!) insulated screwdriver, just go near the cap from the flyback and if everything back from the flyback is good a spark should jump to the screwdriver tip. If this spark is less than 1/4 inch I would look to horizontal/damper/yoke circuit. If it is good, look for troble in the 1X2 circuitry.
Don't ground any part of the screwdriver. Hold the plastic end and just go near the cap with the tip. Don't leave the set on a long time as the flyback will be unloaded at the time of testing.