Discharging a VT100 CRT

[Julian Wolfe]

Understood, and yes I respect the voltage those things put out.  That is the
reason I use a long plastic adjuster for this and not a screwdriver.
However, the good part about those adjustments is that you do not have to
directly work with high voltage like you do on a freshly turned-off flyback,
only avoid it.

In any case, I'm very careful and methodical about it, and that's what
counts.

-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
On Behalf Of Tony Duell
Sent: Thursday, November 03, 2005 2:11 PM
To: cctalk at classiccmp.org
Subject: Re: Discharging a VT100 CRT

> And Pat, you're also dead on about the controls, I had to readjust those
> twice before when the flyback was going in a hurry, and had to do it live,
> but I was a lot less scared of that - I knew as long as I stayed way from
> the CRT I would be fine.

Hmm.. A little knowledge can be dangerous.

The EHT -- the 15kV to the final anode -- is pretty well insulated when 
the terminal is in operation. The flyback is potted, there's a 
well-insulated lead to the anode connector, then the connector itself. 
It's pretty hard to touvh it by accident.

But the 'screen' and 'focus' controls set the voltages of 2 of the 
electrodes in the gun. Typically there will be a few hundred volts on 
them. And those voltages are on the PCB tracks, on the terminals of the 
presets, and so on.

No, they're unlikely to be fatal, just unpleasant. But they are much 
easier to touch by accident.

-tony