[Heathkit] O-12 power transformer

[Richard Knoppow]

      I may try this.  The scope is not worth what having the 
transformer rebuilt would cost.  I have found transformers where the 
winding had let loose where connected to the terminals or leads. Maybe 
here too. At least its worth a try.   Thanks for the encouragement.

On 3/10/2015 9:02 PM, Kevin Ward wrote:
> Richard -
>
> Once upon a time someone gave me a piece of equipment (Knightkit I 
> believe) which he said "just quit operating."  The filaments powered 
> up but as the saying goes, "the lights were on but nobody was home."  
> My friend said there was no flash, bang, or smoke - - it just quit!
>
> A quick check with the VOM confirmed an open winding in the power 
> transformer.  I made a quick sketch with notes on where all the wires 
> went and dug out the transformer.  I pulled off the end bells and had 
> a look.  The winding had parted, right at the end of the last turn of 
> the winding.
>
> I had to unwind a single turn to get a free end I could work with, but 
> I was able to restore operation.  I replaced both electrolytics 
> because one had a bulge, even though both tested OK, and never had 
> another problem with that unit.  I recommend you replace those caps.
>
> If you're going to replace the transformer anyway, you have nothing to 
> lose by pulling it and having a look.  Just don't forget to document 
> your work as you go.  Especially if you don't have the manual and 
> schematic.
>
> Kevin  N2IE
>
>
>
>
>
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL