[Amps] Buzzing transformer

[Gary Smith]

> If the transformer runs at its normal temperature, then it is probably
> just a loose lamination - not usually a problem, just annoying.

I remember having a transformer buzz due 
to loose laminations. I mentioned it to a 
friend who did castings at work and he 
said to bring it by. They had a vacuum jar  
large enough to put it in. We slathered it 
with glue ( I can't recall which glue it 
was, it was not viscous ). He put the 
transformer inside the jar and sucked the 
air out while it was covered with the wet 
glue. 

It bubbled for a bit while the air was 
being sucked out of the 
laminations/windings. When the bubbling 
stopped he released the suction and the 
glue was instantly sucked into the 
laminations where the air pockets had 
been.

a couple days later the transformer was 
dry & sealed up internally by that glue, 
and that buzz was completely gone.

73,

Gary
KA1J