[RodB]

Remove the plug from the power source, be sure the dial lamp is disconnected, connect an ohmmeter to the prongs on the plug. If there's a short you will see a reading on the meter of close to zero ohms. Now you have a visual indication of the problem. If this happened since you have been working on the radio then you have inadvertently caused the short, either from soldering or a frayed strand of wire or a bad part. Since you have removed the line caps and dial light there's just 2 possible circuits involved. One is the tube heater string and the other is the rectifier circuit. Remove the wire that goes from the power cord to the rectifier and see if the meter shows two or three hundred ohms. If so, then the short is in the circuit of the rectifier. If, after removing the wire to the rectifier, you still have zero ohms then the problem is in the heater string. Check each tube socket wiring especially in and around the heater pins. You have to use this process of elimination to get to the source of the problem. Don't apply power until you find and correct the problem.