Step-up Transformer

[Shambler]

A transformer consists of 1 or more coils of copper wire wound around 'laminations' which are thin sheets of steel placed on top of each other to form a block.

With age these laminations can get loose and start to vibrate at the same frequency of the supply...this is normal but can be annoying.

I have heard one person recommend pouring some super glue into the gaps between the laminations on all sides of the block in order to stop them vibrating but I don't know if this will work...worth a try though since large transformers cost a packet.

Either that or put it in a soundproof box...or another room

[austin_tacious]

Reading this again... is it a mechanical vibration from the unit itself? I WAS understanding it was causing a ground loop. If it's just a mechanical hum that's not unusual at all.

[Hollowcell]

Thanks for the replies everyone.

Yep, it's a mechanical hum. I think it's just down to the age of the thing itself.
I have read up about magnostriction (think that was what it was called), and how vibration can occur. Just a bit pissed that it has to happen in the studio. What can you do I guess.....

hehe super glue isn't a bad idea - don't think I'll try it just yet though. Maybe I'll wait till I get a fire blanket or similar ready.

For now, I have cased it (not tightly) in some sound proofing and put it as far away as possible in a roomy cupboard.
It's doing the trick, but it won't be the best once summer comes around.