[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [TCML] CRT wire - harvesting safely



Hi all,

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.

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


Tony Greer

David Rieben

PS:  I'm glad that it was ONLY a 19" TV and not a 27"
or a 32" set!
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla