09-04-2023, 07:45 AM
Since a picture is worth 1,000 words (or 10,000 of my words, attached below is a partial schematic of a Philco Model 20 Power supply section with the diode mod and fuse added:
It is not necessary to do this mod on sets with 5AR4, 84, 6X5, 7Y4 etc. rectifiers, as these tubes have a "heater/ sleeve" cathode arrangement, which are not likely to short.
I cannot remember where I learned of this mod, I did not think it up myself. I believe that it was from "Phil's Old Radios"; I am not sure. However, I gratefully give credit to whomever thought this up and first published it on the internet!
It is not necessary to do this mod on sets with 5AR4, 84, 6X5, 7Y4 etc. rectifiers, as these tubes have a "heater/ sleeve" cathode arrangement, which are not likely to short.
I cannot remember where I learned of this mod, I did not think it up myself. I believe that it was from "Phil's Old Radios"; I am not sure. However, I gratefully give credit to whomever thought this up and first published it on the internet!
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards,
MrFixr55
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
