Ok I’ve tried digging around and only found a few threads that were close but no cigar. Yup another amp hum thread. I’m close at this point but here’s my problem. Amp on and nothing plugged in it’s quite. I can turn volumes or tone full and only getting the expected light hiss. If I plug an instrument in and turn the volume up I get hum. It increases with volume and changes “pitch” when the tone is increased. Guessing something around the inputs. Before anyone asks, I have tried numerous guitars. From single coils to humbuckers even emgs. Numerous cables and even tried different locations. If ignore the hum it sounds amazing. This is not a new build. It started life a handful of years ago as a Mojotone build. Since then it has gone through numerous mods, back to stock then modded again, ect ect. It has always had hum to some degree. Currently it has a classic-tone 40-18078 PT using the 355v. I have a NOS 5y3. My voltages are sitting at then levels everyone posts as normal. The volumes/tone have been changed to the 6g3 layout. I know it’s not a true 5e3, but currently suits my needs. I’m sure at some point it’ll go back to stock again. The tubes are all new. And I had tried my back up sets with no change. I just rewired the filament heaters. Changed out filter caps. And corrected a few ground connections. The grounding is the same as on Robrobinettes 5e3 page. The center tap is elevated. This all got rid of a slight bit of hum that was happening all the time. I will of course go back over wiring and solder joints again and again. A few more eyes and a ton more experience would be greatly appreciated. I can supply more pics if needed of course.