Espoverload
Sorry I just reread that you have tried new amps etc. Forgive me for being dense. If you know some one with a power conditioner that may be an easy test. Also several years ago I noticed my lights in my house dimming at erratic intervals. This kept happening and it worried me so I had the electric company take a look at my power. On the outside of your house is a a meter. It is fed on three legs. Each leg must read equal voltage. Mine did not. Upon investigation the power company tech said one of the leads was loose at the box in the back yard. This box fed 2 or 3 houses. It is sounding like you have a power problem in your house. Some fluke meters (voltmeters) have ocilliscope screens so you can take a sample of the power at your outlet and see if there is some large scale noise in your ac supply. Good luck!
Sorry I just reread that you have tried new amps etc. Forgive me for being dense. If you know some one with a power conditioner that may be an easy test. Also several years ago I noticed my lights in my house dimming at erratic intervals. This kept happening and it worried me so I had the electric company take a look at my power. On the outside of your house is a a meter. It is fed on three legs. Each leg must read equal voltage. Mine did not. Upon investigation the power company tech said one of the leads was loose at the box in the back yard. This box fed 2 or 3 houses. It is sounding like you have a power problem in your house. Some fluke meters (voltmeters) have ocilliscope screens so you can take a sample of the power at your outlet and see if there is some large scale noise in your ac supply. Good luck!