z wrote:

Anyone knows which circuit in a tv set is resposible for the
brief delay between switching the set on and the appearance
of an image on the screen?

In most sets today there is what you call an IK curcuit, what this does
is let the guns come up to snuff equally. It keeps the picture of till
they are of equal value so you don't get and of color picture.when the
CRT starts to go south or weaken it takes longer. sometime if you crank
up the g2 on the flyback ,just a slight tad, it will force the picture
to come on sooner. but is sounds as though your crt is getting weak