[Boatanchors] Comet Pro Trasformer Went South

[Bill Cromwell]

On 07/14/2013 10:31 PM, hwhall at compuserve.com wrote:
> If it were my next move, I'd disconnect all but the xfmr's primary and 
> apply power. If the transformer doesn't get hot then you know you've a 
> problem somewhere in the rcvr that is overloading the xfmr. If it gets 
> hot just running by itself, you know the xfmr has windings gone bad 
> such as shorted internally.  The resistance mismatch between the two 
> rectifier plate leads (112 ohms and 82 ohms) seems to suggest a short 
> on the lower resistance side. Ideally they would be almost the same 
> resisitance. (Hope I'm wrong though!!)
>
> Wayne
> WB4OGM
>
>

Hi,

He could lift one of the filament leads from the transformer to 
complete;y isolate the primary (or pull all the tubes. He already 
isolated the high voltage side. It does sound like the transformer is 
toast (but maybe not. Smoke and aroma from a transformer are not good 
omens. Best to find out why before installing another transformer.  
Sometimes a filament does fail shorted even though most of them fail open.

73,

Bill  KU8H