First episode: July 1, 1974
Last episode: January 3, 1975
Seen weekday mornings 10:30-11:00 on NBC
Players earn letters by answering questions (as in the later series Blockbusters, the answers to the questions begin with the letter selected by the player), then use those letters to form words.  In the unusual bonus game, players reveal letters on the game board one at a time, and each time must form a word that uses all the letters shown.  As with many Bob Stewart shows, the format was modified during the run of the series.

Read a Variety review from July 3, 1974

In the show's original double-or-nothing scoring structure, significant paydays were possible, though unlikely.  Announcer Don Pardo said in the original opening that players could win "more than $100,000" but also cautioned that they "could go broke".  Researcher Daniel Benfield tells us that the theoretical top prize for clearing the entire game board was a whopping $409,600!  In reality, payouts tended to hover in the low thousands, consistant with what most game shows of the time were offering.

Winning Streak
owns a strange footnote in game show programming history.  When it debuted, it took the Jeopardy! time slot on NBC's daytime lineup.  (Jeopardy! moved to the time period vacated by Bill's earlier series, Three on a Match.)  Six months later, Winning Streak was replaced in the line-up by Wheel of Fortune. Years later, those two legendary Merv Griffin shows would become the biggest hits in syndication history.

Winning Streak would also mark the last teaming of Bill and veteran announcer Pardo, who worked together on Bill's first network series, Winner Take All.  The pair also worked together on The Price Is Right, Eye Guess and Three on a Match.  A few months after Winning Streak ended, Pardo became the announcer for Saturday Night Live, a job he has held for all but one season of the show's historic run.

In a 1975 magazine article, Bill commented on the failure of this show and Blankety Blanks.
One episode has aired on GSN: The Network for Games.  It's from August 9, which would have been the day after Nixon resigned.  Our theory is that the episode was originally pre-empted for news coverage, and ended up in some different stack of tapes that survived when the others were destroyed.  The pilot for the series, shot on May 5, is in the vast holdings of the UCLA archives but is not available for viewing there.  In addition, we have the opening minutes from the December 26 episode, and have posted them to YouTube.
Watch, exclusively, our all-too-brief clip from December 26:  Winning Streak

Curt Alliaume's Winning Streak page at Game Shows '75
The Winning Streak section of TV Party's 1974 Game Shows
The Winning Streak page at Adam Nedeff's Bill Cullen's World
The Winning Streak page on Wikipedia