Would TV Column fans be astonished to learn this mid-August morning that Things Are A Tad Slow right now in Tubeland? . . .

And that, as a result, our very first item this morning is going to be about the daytime reruns of "Diff'rent Strokes" on NBC? . . .

The first week "Strokes" showed up in the 10 a.m. time slot, back in April, the program averaged only a 2.4 Nielsen rating (that's about 1.9 million TV homes) and a 12 percent share of the audience. . .

But by the week ending July 23 . . . "Strokes" was up to a 4.6 Nielsen average (representing 3.7 million homes) and a 22 share . . .

Look. I was straight with you. I came right out and told you it was going to be a little slow this morning but that doesn't mean you can fall asleep right in the middle of the first item, for gosh sakes . . .

Anyway, that jump in the ratings has persuaded NBC to extend the daytime run of "Strokes" through Dec. 10 . . . after which it will be replaced by reruns of "Facts of Life". . .

Where's everybody gone? . . .

A U.S. District judge in Los Angeles has ruled that a ban on editorials by public TV and radio stations is unconstitutional . . .

The ban had been written into the Public Broadcasting Act of 1967 . . .

The suit had been brought against the Federal Communications Commmission by the League of Women Voters of California, the Pacifica Foundation and Rep. Henry Waxman (D-Calif.) . . .

Pacifica Foundation operates five noncommercial radio stations . . .

A source at the Public Broadcasting Service here yesterday said the lifting of the ban by Judge Malcolm M. Lucas probably would have little practical effect on current PBS station policies . . .

Many public TV stations in the country, he explained, rely on funding from state or federal tax revenues and that over the years, station managers had "unofficially" come to the conclusion that "it would not be appropriate" for a station funded, say, by a university, to editorialize on particular issues . . .

Channel 4 has hired Mike Crew to be executive producer for newscasts . . . replacing Bruce Cummings, who has moved to the NBC News bureau here . . .

Crew, who starts Monday, comes from KPIX in San Francisco . . . where he's been assistant news director for the past two years . . .

ABC's "Good Morning America" won the early morning ratings race last week by the widest margin ever over NBC's "Today" show . . .

Through Aug. 6, GMA averaged a 5.1 Nielsen and a 30 share, compared with "Today's" 3.5/20 and "CBS Morning News' " 2.8/16 . . .

ABC isn't quite sure why GMA opened up that record 1.6 Nielsen point spread on "Today" but thinks maybe the week-long examination of unemployment may have helped Moving Right Along

Post-Newsweek Video is taping the TV pilot of the "The Larry King Show" Sunday afternoon at the U.S. Chamber of Commerce and if you'd like to attend, you can call 342-3825 for a reservation . . .

P-NV hopes to launch the weekly 90-minute version of the popular radio talk show by the second week in January . .

Marketing strategy is to aim for the 11:30 p.m. Sunday slot at stations around the country . . . The program is to be satellited live from Washington . . .

Veronique Rodman has been named coordinating guest producer (translation: She books the guests) for "This Week With David Brinkley" replacing Peggy Whedon . . . who becomes a free-lance producer assigned to ABC News programming. . .

Rodman comes to ABC News from Georgetown's Center for Strategic and International Studies . . .

Previously she was a staff assistant to Dr. Henry Kissinger, from May 1978 until October 1979 . . .

Also at "This Week" . . . Patrick Roddy has been promoted from producer to senior producer . . .

And while we're in the neighborhood . . . let's report that on Sunday "This Week With David Brinkley" will be telecast from Vail, Colo. . . . where the American Enterprise Institute's first annual World Forum is being held . . .

Guests will include former U.S. president Gerald R. Ford . . . former British prime minister James Callaghan and former French president Valery Giscard D'Estaing. . .

Hello? . . .