[Boatanchors] Comet Pro Trasformer Went South

[Bill Cromwell]

On 07/15/2013 07:01 AM, GARY BROWN wrote:
> Filaments almost always fail by being shorted, not open. Filament 
> windings use a heavy wire and it would take allot of current to melt 
> them into an open condition. Most power transformers have the filament 
> windings wound over the hv windings. When the hv winding is under an 
> overload condition, it tends to heat the filament windings to a point 
> that they become shorted.
> Regards,
> Gary

Hi Gary,

I see that you did say *almost* right up front. I have experienced three 
filaments that failed short in 66 years. Can't say "never" and if you 
don't eliminate the possibility you could get bit.

73,

Bill  KU8H