[jerryhawthorne]

LC, it certainly sounds like you may have some unfiltered B+ meaning some caps in backwards perhaps or miss wired. With the volume control on the antenna it is not helping isolating the problem. Check your caps again try pulling the second detector tube and turn the set on. Still hum? At least that will tell you a little more information. If you have hum, it is from the amplifier section. Probably something in the filtering section of the power supply. If you don't have the hum, try pulling one tube at a time from right to left on the schematic to see if it goes away. A cheap easy way to look for isolating the problem. I could be a cathode to filament leakage in any of the tubes putting some A/C into the the signal path. If you can pull tubes one at a time and still have the hum (not the output tube) it is no doubt bad filtering in the power supply