I don't think there is ever a time when nothing is playing.
Jack Parr and Steve Allen and Johnny Carson replaced test patterns.
Johnny Carson obviously did not replace any test patterns.
He was a relative Johnny-come-lately.
TV was well along b4 he arrived.
Johnny Carson replaced Jack Paar on the Tonight Show
B4 that, he was a mid-afternoon game show host;
Do You Trust Your Wife
; renamed Who Do You Trust
While walking in the street in mid-town Manhattan,
I was accosted and offered a ticket to
his game show, either in the 1950s or early '60s.
I attended it.
I remember seeing his game show, at home.
He had a habit of turning around and looking
over his left shoulder, while interviewing his
guests on Who Do You Trust
I used to wonder what the hell he was looking at
behind him so much. When I attended his show,
I saw that he was looking at Ed, off camera.