[AMRadio] transformer rattle - kill or cure?

Jim Wilhite w5jo at brightok.net
Wed Dec 23 12:07:41 EST 2009

You might remove one of the end bells and try inserting something 
between the bobbin and the laminations at the end.  Maybe that is a mite 


> On Wed, Dec 23, 2009 at 10:39 AM, AirRadio <AirRadio at dsl.pipex.com> 
> wrote:
>> I have a mains transformer in my latest boatanchor, it is rattling 
>> like mad, eventually goes away after an hour or so, I thought about 
>> dropping it in a can of varnish, anyone cured one before, any luck or 
>> waste of time?
> Sounds like it abates once things settle in thermally.The simple
> approach I'd try first Max is to check the tension on any securing
> bolts through the transformer laminations or chassis. Sometimes that
> takes care of it. Other methods include removing the transformer and
> re-sealing the laminations it in hot varnish, or isolating the
> transformer from the chassis on rubber bushings. The latter is not a
> good idea IMO due to safety concerns with internal shorts which would
> otherwise become apparent when the case is grounded to the chassis.
> Gary WZ1M is a member of this list and has a transformer rebuilding
> business, so he can certainly provide you with some pointers. I think
> Don K4KYV and a few others have successfully dealt with similar
> problems with success. It might be as simple as tossing he transformer
> in the oven for a while on its own if tightening the bolts doesn't
> cure it.
> ~ Todd,  KA1KAQ/4

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