My Smart Theatre Systems TA 242 amp develops a transformer buzz, chassis only ( not through the speakers ), when it is on and I am using my otr microwave. Of my many amps, it happens only to this one ( I haven't tried a cheater plug ).
Classic Over-reaction!
So today I was listening to a new vintage LP that had just arrived. And when I switched cables from my phono stage to my Hegel 160 integrated - just to note sonic differences between cables -- I noticed that all of a sudden - for the first time - a noticeable hum was emanating from the Hegel’s transformer.
Crap. What now?
I switched back to the original cables. Nothing. The hum was still there.
I tried different tubes in the phono stage. Nothing. The hum was still there.
I unplugged the Hegel from the wall outlet and plugged it into the power strip. Nothing. The hum was still there. I switched everything off in despair and moped upstairs for dinner.
Where I noticed the toaster oven was on. Hmmm. A few minutes later the toaster oven dinged and turned off and I went downstairs, turned the Hegel on, and the hum was gone.
Sigh....
Crap. What now?
I switched back to the original cables. Nothing. The hum was still there.
I tried different tubes in the phono stage. Nothing. The hum was still there.
I unplugged the Hegel from the wall outlet and plugged it into the power strip. Nothing. The hum was still there. I switched everything off in despair and moped upstairs for dinner.
Where I noticed the toaster oven was on. Hmmm. A few minutes later the toaster oven dinged and turned off and I went downstairs, turned the Hegel on, and the hum was gone.
Sigh....