[vcf-midatlantic] Any trick to discharging ADM-3A

E.M.F. ef1j91 at gmail.com
Fri Feb 9 22:58:26 EST 2018

> On Feb 9, 2018, at 5:34 PM, Ian Primus via vcf-midatlantic <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote:
> I just loosen the screw holding the yoke clamped in place so it can be
> rotated. Then, turn the monitor on, and rotate the yoke with my hand
> until the raster is level. Shut it off, then use your screwdriver to
> tighten the yoke in place. Tighten the screw down until the picture
> tube implodes, then back it off a quarter turn.  :)   But, seriously,
> don't crank it down super tight, just enough to hold it snug.
> When rotating the yoke, don't touch the terminals where the windings
> are connected. Those will give you a very painful shock. Avoid
> touching the windings themselves if possible - just grab it by the
> plastic part.
> Technically, you can loosen/tighten the yoke clamp with the power on,
> but there is no reason to, always a chance to drop the screwdriver
> into it. Similarly, the windings are insulated with enamel - you can
> touch them, but I avoid it because there is no reason to touch them
> and any crack or damage in the insulation will certainly be noticed.
> You don't need to discharge the tube unless you plan to disconnect or
> otherwise touch that second anode connection. The bell of the tube is
> grounded, and the yoke itself is insulated wire on a piece of plastic.
> The neck of the tube is just clear glass and has no electrical
> properties.
> -Ian

Awesome. Thanks for the help! I have to work on making a lower character rom next.


More information about the vcf-midatlantic mailing list