[Milsurplus] [Fwd: [Boatanchors] solder whiskers grow on "non lead" solder]

[Peter Gottlieb]

When I was growing up I lived near NYC and all TVs had electrostatically 
attracted soot and dust in them.  It would crackle and arc over if not 
cleaned periodically.  Even the face of the CRT would get a layer of 
black soot after a short while.

My first exposure to whiskers was in computer rooms with a galvanized 
floor structure.  Cool air was blown in the floor up into equipment 
racks and there were failures due to shorting in our voice response 
system due to this.  I left that company shortly thereafter so never 
heard if there was an ultimate solution such as filtering, but I do know 
IBM had all sorts of grief with it as well.

Peter



On 1/9/2011 5:22 PM, KD7JYK DM09 wrote:
> It could have been lead and lead does oxidize black.  I have a hallicrafters
> TV and opened the rectifier shield a few months ago, it too is covered in
> black dust, but in this case, it is dust that migrated in due to static and
> cooked.  There is also evidence of tracking in the dust.  You will find that
> black dust around the rectifiers and flybacks on most old TVs.
>
> Kurt
>
> ----- Original Message -----
> From:<hwhall at compuserve.com>
>
> picture tube HV rectifier. I assumed it was lead. But all over the inside of
> it were dark colored whiskers - none on the outside. I assumed at the time
> that something radiating from the rectifier was responsible for the crystal
> growth.
>
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