[MrFixr55]

Hi poulsbobill,

I have not worked on one of these, but other than the 115V / 220V Ballast, the set is straightforward.  Looking at the schematic, there appears to be 2 ways to install the ballast.  I would think that there are 2 notches in the octal socket for the ballast; one position for 115V operation, one for 230V (or whatever) operation.  Looking at the schematic for the radio and for the ballast, in the 115V position, no current goes through the resistance element in the ballast.  For 120V, all current goes through jumpers.  See the following marked up schematic for what is jumped.
   

With the ballast in the 115V Position:

• R103 is bypassed by a jumper in the ballast and full rectifier output is connected to R104.
  
• 120VAC is supplied by a jumper in the ballast to the rectifier plates (in parallel).
  
• 120V is supplied by a jumper in the ballast to the junction of R102 (in series with the heater string) and R101 (in series with the pilot light). 
  

Do the following:

• At the very least, replace the electrolytic filter caps.  They usually open when dried out, causing a major hum but sometimes, they short, burning out resistors, tubes, etc.
  
• Verify that the ballast is installed in the position for 115V operation.
  
• Verify that when S100 (power switch) is closed, there is Zero Ohms across the switch.
  
• With the switch closed, and ohming between both prongs of the power plug, you should find somewhere between 50 and 100 Ohms (with the tubes cold).  
  
• If this is not the case, check the tubes (The pin numbers are on the diagram, but for all of the loctal tubes, the heaters (filaments) are on pins 1 and 8.  The 25L6 heaters are on pins 2 and 7, and the 25Z5 heater pins are 1 and 6, the 2 pins that are wider in diameter than the others.
  
• If the heaters light but there is no sound, verify B+ to all points where B+ is expected, Ohm the speaker and the output transformer, the usual troubleshooting.
  

One other important thing: This is a warm chassis set (capacitor, 100K resistor or both connecting chassis to "Common" (B-, low side of heater string). To make things worse, the switch in the "common" lead, not the "high side". The following article from "Phil's Old Radios" explains the issue caused by this.
https://antiqueradio.org/safety.htm

This is an interesting set. Instead of a power transformer selectable for 115 vs 220V AC and instead of using the 25Z5 as a voltage doubler in the 115V mode (Would work only on AC) and normal half wave rectifier in 220 VAC or DC Modes, the B+ is limited to about 110V. This set would totally rock with 200V or higher B+, especially with the 25L6s in Push Pull mode and the 8" speaker. As it is, the multiple bands for shortwave allow a high level of "band spread".
Keep us posted. Hope this helps