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Capehart-Farnsworth timeline: 400 series Loudspeakers

Ernst Erb Jürgen Stichling Bernhard Nagel 
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Forum » Radio- and technical History » Decades of broadcasting » Capehart-Farnsworth timeline: 400 series Loudspeakers
Ernst Erb
Ernst Erb
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24.Sep.12 18:49

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This article should show at last the overview about the different main parts that form a series 400 model. In fact this comprises also series 300, 200 and 100, the so called DeLuxe models with turn-over mechanism. I try to show each of the important items in a separate thread. It covers 1931 to 1950, the whole lifetime of this concept.

The intention is to show at last different threads for cabinets, Escutcheons/scales/knobs, record changers, tuner chassis and amplifier chassis, loudspeakers and pick-ups. For more or other information there is the general thread Capehart Radio-Phonographs for the 1930s and 1940s.

Capehart-Farnsworth timeline:
400 series Loudspeakers

The series started for the season 1931/32 without "season suffix" and followed with A, B, etc.


First saison: 1931/32 - no suffix

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A = 1932/33

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B = 1933/34

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C = 1934/35

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D = 1935/36

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E = 1936/37


The E-series DeLuxe Capeharts use Jensen loudspeakers.

F = 1937/38 See full documentation on model page 400F

The "F" loudspeakers seem to be the same as for season "E" - at least they are also Jensen loudspeakers.  

G = 1938/39

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H = 1939/40

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K = 1940/41

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Series 100K2FM Jensen speaker 81-64 Jensen Patents

See the two patents mentioned, number 1,721,023, patented July 16, 1929 for Peter L. Jensen (Alameda, CA), assignor to Karl K. Jensen (Piedmont, CA). Was filed October 26, 1927 as number 228,807.

The other is number 1,750,009, patented March 11, 1930 by Karl K. Jensen, filed January 28, 1928 as number 250,193.


Speaker in 113K2FM see here The two Jensen patents see here


M = 1941/42

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N = 1945-48

414N speaker 728B see here See there also the diaphragma
  31N4 speaker see here


P = 1948-50 - last series

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This article was edited 24.Jan.13 13:54 by Ernst Erb .