Transformer Hum.

[Guarnera]

I've assembled my power supply chassis for my new TSE 300B Amp. I'm getting a little buzz from my Power Transformer. It's bolted down tight to a 1/4" aluminum top plate on a wooden chassis. Should I try loosening the screws holding it down? Put some neoprene under it? What should I try? I can't hear anything while music is playing, but when it's not, and I get close to the amp, I can hear a little buzzing. Thank you all very much.

 

[azazello]

Try with screws and also try put transformer /without shields/ in lack for yacht or in some fast drying lack for few hours and then dry....

 

[faithintruth]

You could try rubber grommets under the feet of the tranny but I think the hum is from inside. I heard of a guy on this forum removing, insullating and then re-installing the end bells....I've never attempted it.

 

[Nico Ras]

Two problems that can cause the buzz. One; you have unbalanced mains, i.e. there is a DC component on your mains. Second: if it is an e-core and the buzz is sharp mechanical then dip the transformer in varnish. Final thought, if the amp is standing on a big hollow cabinet then it can be minute vibration coupled into the cabinet amplifying the buzz. Try isolating the amp from the cabinet.

Good luck

 

[Guarnera]

Thank you all for the suggestions. As soon as I have time I will look into seeing if I can reduce or eliminate the buzz. thanks again.