Hum on Tube Amp - Can't find source

@ervikingo Hate to say it but I keep thinking about your neighbors WiFi transmitter system. 

I spent 20k on buying 2x PS Audio P20 AC regenerators and I still have a hum. Also it is rare that 60hz is the only frequency usually you get a lot of 120hz the harmonic. Test to see your ground and neutral voltage should be very low if it is anything above 1 or 2 volts that could be it. Also a new TV or radio station in the area. I love tube amps but I'm thinking they are such a pain. 

@hiend2 

Try a solid state unit...

ervinkingo has tried that already, and the solid state amps don't hum. Please look back at some of the past comments.

@donavabdear 

I love tube amps but I'm thinking they are such a pain. 

I agree with you, and that's one of the reasons why I no longer incorporate them into my systems.  

@ervikingo 12AX7s trade high impedance for more gain so could be sensitive to a variety of variables. So going to 12AT7s may well solve the issue. 

I've also found that the brand of tube can sometimes cause hum. For example a phono section I was working on exhibited a hum a few minutes after warmup. The customer had replaced the stock 12AX7 tubes with Brimars, which are supposed to be a nice tube, but for some reason, even though the filament supply was regulated DC, the tubes would hum. Replacing them solved the problem.

@dpop thanks for adding my comments and past attempts.  Those links are very useful !  The reviewer said they are dead quiet.  Hoping I get that

@hiend2 @donavabdear thanks for the input

@atmasphere Can’t wait to get the tubes here. In hopes of staying away of issues like you mention, I ordered them from Manley.

Sure hope that solves the problem. I have tried so many things and never looked at that detail. Sometimes the simplest answer is the best one.

Sometimes the simplest answer is the best one.

Yes- if more people understood Occam's Razor the world would be a lot calmer place to live.