[AMRadio] Transformer

Alan Beck abeck at xplornet.com
Fri Feb 2 13:06:44 EST 2007

Hi, I seem to remember that there was something called a megger in school.

Was that something that tests using high voltage tests in an effort to 
see if it will breakdown?

I remember what a Variac does, you can use it to bring an old radio to 
life by starting at a low voltage and increasing to operating voltage, 
it is supposed to rejuvenate the caps.


W4AWM at aol.com wrote:
> Hi Rick,
> If you have access to a megger, that is one way to find out for sure, but if 
> you are getting those readings on an ohmmeter, I am afraid you have a problem.
> Baking it may help, but the problem is that the wire in the primary and 
> secondary is  insulated and leakage indicates that the insulation has broken down 
> which is why you are seeing anything other infinity on the meter.  Depending on 
> how the leads are brought out, there is the possibility that there is a 
> breakdown on the terminal board if there is one.  If the leads come out of the 
> windings out of the tranny housing as pigtails, the problem is internal.
> Hope this helps. 
>  73,  
> John,  W4AWM
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