Re: Blowing out a cathode-G1 short, the extreme way

Wiebe Cazemier <wiebe@xxxxxxxxxxxx> wrote in
news:1b384$48341d0e$d4cc82be$20634@xxxxxxxxxxxxxxxxxxxxxxxx:

Hi,

Because all else failed, I want to go to the extreme in blowing out the
cathode-G1 short, from which my Eizo T766 19" CRT suffers. After the
capacitor discharge, the short has gone from 1K ohm, to 0.0 Ohm, and I
can make the internal wiring of the tube red hot by running 3A of
current through it...

The repair FAQ mentions using a Tesla coil. The nearest thing to a Tesla
coil I used, was the 750V G2 of another (scrap) monitor, but that can
only be sustained for a fraction of a second before the monitor shuts
off; nowhere near the 10 seconds the repair FAQ states.

My question is this: can I use the anode and ground wire of another
monitor to act as my Tesla coil? How do I prevent breakdown of air
and/or vacuum around the CRT pins and such (I don't want arcing in the
wrong place). And, very importantly, can the flyback sustain such an
arc? I've seen videos on the internet in which they use the anode of a
monitor to create a sustainable arc between anode and probably ground,
but I don't know if it needs to be modified for that (because an arc is
basically a short).

I think you will need a LARGEr value capacitor, charged up with plenty of
coulombs of electrons.

Keep your wires thick and short.

With the dead short, you don't need high voltage, you need high current but
only for a short time.
You want to try to blow out the weakest point in the circuit and to hope it
is the recently created short.

It is too late for the Tesla coil. That might have been useful when there
was not a dead short.

















--
bz 73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
infinite set.

bz+ser@xxxxxxxxxxxxxxxxxxxx remove ch100-5 to avoid spam trap
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