Unplug the TV. Find a screwdriver with an insulated rubber handle. Wrap a wire around the screwdriver, and attach the other end to a grounded object. Grounded objects include the screw on a lightswitch, the middle, round prong on a north american power outlet, or sticking a metal pole into the actual ground outside. Now, insert the screwdriver under the rubber “suction cup” anode. You should hear a loud spark. The tube is now discharged, and you can safely touch it until it’s plugged in again.

indeed, not hard, but death is waiting in the wings for those who take the back of a tv off lightly. There is enough juce in a tv thats been off for ages to send a fiddler right across a room, dead.

So please understand what your doing and the risks your taking, be carefull.

On a lighter note, i first came across the wobblevision bend hooked up to a dudes amp playing hawkwind-hurry on sundown an age ago. Twas a very spacey pad with that thing twiching in the corner to dave brocks wibbles.

I once designed a device to display time on a CRT using Lissajous patterns, but it strove for a “good” display ethic.

I’m surprised the mod is this simple (albeit potentially very dangerous).

One or two of the patterns are relatively easy to produce on an oscilloscope or a program that emulates one, but I have no idea about the rest.

A very cool retro display.