Re: [TCML] CRT wire - harvesting safely

[Sfxneon@xxxxxxx]

Worst case is when you pick up a large CRT and it gives you a nasty shock,  
causing you to drop it on it's face. If you've ever seen a big CRT implode, 
 you'll have a healthy respect for what can happen!
 
Tony Greer
______________


Tony Greer wrote:

> Something else to  consider it that CRTs are in effect, a Leyden  jar
> capacitor, and  can store a potentially hazardous charge for a very long 
> time!  Be
> sure to first discharge the CRT by connecting a ground wire to the  
> chassis
> (or the conductive outer coating on the CRT) and then  touching it to the
> second anode button on the side of the CRT. Keep it  there a while 
because 
> a
> residual charge will build back up if  only touched briefly.
 
 
In a message dated 2/8/2010 6:37:54 A.M. Central Standard Time, 
_drieben@xxxxxxxxxxxx (mailto:drieben@xxxxxxxxxxx)  writes:
Hi  all,

Tony is absolutely correct about this aspect of CRTs and I
can  vouch for it from personal experience! About 20 years
ago, I had a 19" color  TV that had gone south on me so I
decided to try to salvage the HV "goodies"  out of it. I knew
that the flyback assembly could put out around 20 kV  but
I did not figure on a significant percentage of that potential
being  retained as a static charge on the picture tube itself
after the power was  removed, as I tore into the guts of the
defunct television set. When I lifted  up the external elec-
troded insulation boot "pasty" on the hihg voltage lead  that
connects to the outer wall of the tube and my fingers con-
tacted the  bare electrode underneath that was underneath
the boot, I received a very  sickening and power jolt of
electricity that nearly knocked me out. OUCH!  Haven't
touched any more salvaged CRTs since then w/out first
insuring  that they are fully discharged! :^0


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