House Wiring Problems

IDK. But I use this with my valve amp. Furman 1800

 

Looks like you changed almost every variable... but yourself. It's a long shot, but who knows. Mobile? Other electronic devices on you?

 

Sounds like a ground issue.

Have any new appliances been added to the home, new lights, fans, dimmer switches, fluorescent lights?

Tried a different cable?

 

A new digital pedal in your chain, perhaps?

 

Try putting some nuts just outside the door, and when the squirrels go to get them, slam the door on them. Or get a cheap circuit ground tester and/or power conditioner.

 

Got scope? Scope the mains. Prove it's there, that's would be my first step. As opposed to being in-air that is.

It's highly speculative and I know you've eliminated some things but @Tom Kamphuys' suspicion of device interference is also my guess just based on what I hear in the video.

 

Sorry, @ArcticWhite, I may be remembering wrong; was it you who had the house wiring that was trying to kill you? Since it's the same everywhere in your home, generalized line noise or some other systemic wiring issue sounds reasonable.

But I also like the @sds1 idea about noise 'in the air.' Ham radios in the neighborhood are infamous, but I've seen long lists of modern gizmos, from cell phones to the fridge, from modems to ceiling fans, that can emit RF in your home. In your neighborhood, the causes are even more diverse and mysterious. For years some neighbor here had something that would occasionally put a rhythmic static on my TV audio receiver. I might try your quietest amp at a (nice) nearby neighbor's home, and also at a friend's in a different neighborhood. If it's only your house, then sort out wiring vs. RF noise....

 

Does your Amp make that sound even when there is nothing plugged in to the input jack?

I had an episode like that with my '73 Champ a while back.

Let me know what you hear.

 

Wifi, cell phone, hell my next door neighbor's clothes dryer shows up on my wifi list.

IoAT: Internet of Annoying Things.

 

What guitar(s)? All guitars?

 

Ok.
Does the Amp feel like it is getting warmer than usual and losing Volume while being played?

 

Do you have two Inputs for the same channel?

 

Electric heat by any chance? I had a similar issue back in June due to one of the thermostats down stairs getting moved just enough to make it hang on the temp threshold cycling on and off. Thought I had a real issue at first with my amp