Run and Networks: The show had several runs on different networks:

• ABC: 13 episodes in 1946.
• CBS: 157 episodes from 1946–1949.
• NBC: 75 episodes from 1949–1951 (with some sources listing 51 or 24 for the final runs).

Cast: The most famous portrayal of Sam Spade in the series was by Howard Duff, who brought a sardonic and often humorous take to the character, contrasting with Humphrey Bogart's film portrayal. Later, Steve Dunne took over the role for the final season on NBC.

Lurene Tuttle was a crucial part of the show's success, playing Spade's devoted and often flustered secretary, Effie Perrine. Other notable actors who appeared in supporting roles included John McIntire and William Conrad (who later famously played Matt Dillon on "Gunsmoke").

Plot and Style: Unlike the darker tone of "The Maltese Falcon" novel and film, "The Adventures of Sam Spade" radio series took a more "tongue-in-cheek" approach. While still a hard-boiled detective show with action, drama, and tough characters, it was infused with a good deal of wit, wisecracks, and humor. Each episode typically involved Sam Spade taking on a new "caper," with titles often following the "Sam and the [Caper Name]" format (e.g., "Sam and the Guiana Sovereign," "The Dead Duck Caper," "The Dry Martini Caper"). Sam Spade would often dictate his case reports to Effie, a running gag in the series.

The series' writing was highly regarded. Scriptwriters Jason James and Bob Tallman even received an Edgar Award for Best Radio Drama from the Mystery Writers of America in 1947. Producer/director William Spier, known for his work on "Suspense," oversaw the series.

Critical Reception and Legacy: "The Adventures of Sam Spade" was a significant hit during the Golden Age of Radio, enjoying widespread popularity and positive reviews. Howard Duff's portrayal of Spade became iconic, defining the character for many radio listeners. Critics and audiences appreciated the show's unique blend of mystery, action, and humor. Its success led to comic strips and other tie-ins. The show is still fondly remembered today as a prime example of top-tier old-time radio detective drama, despite the change in lead actor and the eventual cancellation of the series, partly due to the McCarthy-era blacklisting affecting Howard Duff.

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