Trivia Question 6/21/12 – 33-1/3 RPM Records

RecordOn this date in history… June 21st, the first 33-1/3 RPM record was released and soon all but replaced 78 RPM records.


In what year was the 33-1/3 RPM record introduced?




At the time the LP was introduced, nearly all phonograph records for home use were made of an abrasive (and therefore noisy) shellac compound, employed a much larger groove, and played at approximately 78 rpm, limiting the playing time of a 12-inch record to less than five minutes per side. The new product was a 12 or 10-inch fine-grooved disc made of vinyl and played with a smaller-tipped “microgroove” stylus at a speed of 33⅓ rpm. Each side of a 12-inch LP could play for more than 20 minutes.

Columbia Records unveiled the LP at a press conference in the Waldorf Astoria on June 21, 1948 in two formats: 10 inches in diameter, matching that of 78 rpm singles, and 12 inches in diameter.Although they released 100 simultaneously to allow for a purchasing catalog, the first catalog number for a ten-inch LP, CL 6001, was a reissue of the Frank Sinatra 78 rpm album set The Voice of Frank Sinatra; the first catalog number for a twelve-inch LP, ML 4001, was the Mendelssohn Concerto in E Minor for Violin and Orchestra, Op. 64, played by Nathan Milstein with the Philharmonic-Symphony Orchestra of New York conducted by Bruno Walter. These two albums are therefore the first long-players.


A total of 37 people checked into the net tonight and 12 of those had the correct answer to the Trivia Question.  Congratulations to:

  • Larry – WB6AZB
  • Dennis – K6DJI
  • Khalil – K6FCC
  • Jerry – KD6JPD
  • Al – KJ6LPE
  • Thomas – KE6MSS
  • Phil – K6MUG
  • Timothy – KJ6TIG
  • Leon – AF6TT
  • Louie – AD6UP
  • Murray – WA6USL
  • Bob – KB6YVA

A big thanks to everyone for checking into the Net.

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