picture question

[Old1625]

Originally Posted by electroking

Hello Old1625,

To answer your last question, I guess the following:

1 - Opening the cathode with the switch would mean routing the video
signal through long wires going to the power switch, not a good way
to deal with a wideband signal like this.

2 - A relay is costly.

How right you are, Jeeves! And that's why all the sets in the day had that spot after shutoff!

But when doing an antique resto what the heck is money....?

The solution would be as someone suggested earlier that happened in IIRC Electrohome, which would be to have the second gang switch on the on-off control introduce a stored + DC voltage to the cathode circuit, which would supply enough reverse bias to make the CRT cutoff until the HT bled down and the heaters cooled sufficiently.

(I may need to rescind my resonse to that post and apologize, as what was said about involving B+ seems to be making more sense than it was at the time--talk about clumsy reverse-engineering here.... )
.....