Larsh began his radio career at WCHL in Chapel Hill, North Carolina in 1960 at the age of 14 as an after-school and weekend job. He also worked at WCDJ in Edenton when his family would go back home during summer break. At some point, he worked for WSSB in Durham, but the time frame is unclear.
Upon graduating from high school in 1964, Larsh moved to Atlanta, where he got an FCC engineer's license, while working on the radio at WDJK. His parents enrolled him in Guilford College in Greensboro in a pre-med course. Larsh dropped out almost immediately, having gotten a radio job at WCOG.
In early 1966, WAYS-AM in Charlotte had begun 24-hour operations. Federal Communications Commission (FCC) regulations at the time required that any station must have an engineer on duty at all times the station was on the air. When Larsh applied for a job there, the station quickly saw an opportunity to fill two sets of shoes with one person, since Larsh already had a First Class license. He was hired to fill the overnight shift.
At WAYS, Larsh met Jack Gale, a seasoned veteran of both the radio and music business who would become his mentor. Larsh later remarked, "Jack (Gale) has forgotten more about the radio business than I've ever known." When asked, he would always cite Gale as one of his major influences.
Larsh's first big break came later in 1966, when he landed a job at WIXY-1260 in Cleveland, Ohio. The evening disc jockey at this station was always called 'Jack Armstrong' after the 1930s radio serial Jack Armstrong the All American Boy. With his fast-talking, young, friendly approach, Larsh became a huge hit in Cleveland - so huge that floundering WKYC-1100 asked him to break his WIXY contract, and come to work for the 50,000-watt station in January 1967.
'Jack Armstrong' was a copyrighted moniker in the market, so Larsh adopted the alias 'Big Jack Your Leader', and went to work for WKYC. He also occasionally taunted WIXY by calling himself Jackson W. Armstrong.
With WKYC being heard all over the eastern half of the US, Larsh finally went national. He attracted fans all over the region, and became a huge hit. WKYC was listed as the number-three -uying influence in Miami in that era, no doubt due to 'Big Jack' and the 50,000-watt night signal that was so strong over the east coast of the U.S.
Larsh moved on, working at other 50,000-watt stations such as WMEX-1510 in Boston; CHUM-1050 in Toronto - KFI-640 in Los Angeles - KTNQ-1020 in Los Angeles, and then came an October night in 1970 when WKBW in Buffalo, New York introduced him as its newest evening personality. After the 7 p.m. newscast, KB listeners across the city and the Eastern Seaboard were greeted by, “This is Jack Armstrong!” as he mixed the Top 40 tunes of the day with a quick wit, jingles and exploding dynamite, as he continued to develop his 'Motormouth' character.
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He had two imaginary sidekicks - the Gorilla, who speaks in a raspy bass and likes women, banana juice and whiskey—in that order. The second sidekick was the Old Timer, who wheezes, tells lame jokes and was always getting shot after one of them. Larsh was known for his distinctive signoff. At WKYC, it was a few catch phrases, spoken over the instrumental version of the Beatles’ “And I Love her”.
In 1971, Armstrong was listed in the Guinness Book of World Records as the world’s fastest talking human. Also that year, he participated in WKBWs War of the Worlds broadcast, a modernized version originally done in 1938 by Orson Welles.
When he left WKBW in February 1973, Armstrong was such a tough act to follow that the station held a two-week Great American Talent Hunt that attracted some of the nation’s top DJs.
Larsh was then hired as one of the original disc jockeys for the all-new 13-Q in Pittsburgh in the early 1970s.
When he arrived in Pittsburgh Jack helped inaugurate 13Q as its nighttime disc jockey, he was just as quick in becoming an instant Pittsburgh legend. In part due to his popularity, the station obliterated everything in its path within weeks and became Pittsburgh's top radio station. But within four years, Armstrong and most of the other original staff were gone, and 13Q's ratings vanished with them. But while he was there, according to Jack, 13Q was like no other radio experience he had ever had at 25 plus stations.
His first daughter was born in Pittsburgh and that was a great moment. His radio "stunts" were very challenging - things like - breaking a rollercoaster-riding record, being in a snake pit in Horne's department store's front window, and being in the victory parade after the Steelers' first Super Bowl win with Franco Harris on 13Q's flatbed truck float. He did his radio show in the nude from the station's showcase windows as he "streaked" Pittsburgh. He also arranged for a new band he had heard in Buffalo to play one of 13Q's free concerts. That was Pittsburgh's introduction to Aerosmith.
In the late '70s, he could be heard on Indianapolis' WIFE before it went dark.
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