Buzzzzzing Transformers

Solid state amps usually have toroidal transformers. If they buzz, I would suspect RCA interconnects, dimmer switches, flourescent lights, and maybe (maybe) the turntable motor. Start by a process of elimination. If the amp by itself (nothing attached) still buzzes, then you may have an ac wiring noise problem or the R/C shunt at the input (if there is one) has a bad cap. Of course, it is possible that the xfmr coupling to the chassis is loose, but both?. BTW, what make amp is it, and what is attached to it and how??

Gs5556, your post motivated me to fix a buzz in my shop stereo. One of my (1980 vintage) PS Model 2 power amps running in mono had a loose transformer mounting screw and a bad electrolytic in the input shunt R/C. A new cap and some duct seal under the transformer got rid of the hum. Now if I could just get rid of the fizzy sound that the same amp has that sounds sort of like pink noise from an FM radio with the tuner being slightly twizzled. Noisy input section transistor maybe? Thanks for any suggestions.

Thank you all for the thoughtful and very informative answers. I am currious, and maybe I should be posting a new thread for the following: I recall having read some years ago about a tweak that a reviewer of "positive feedback" performed on his amp's toroidal transformers. He removed the top holding plates and the screws that hold them to the chassis and just let the tranformers stand in place without any fasteners. He reported that the music was sort of liberated and that detail and inner resolution etc, etc, increased dramatically. Of course he warned that the transformers were loose now and any attempt to move the amps should be done very carefully! or disaster could ensue.
How do you like that?
Ted