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International Kadette Model 400 4-Tube Battery-Operated Superhet.
Radio Service Data Sheet
July 1936 Radio-Craft

July 1936 Radio-Craft

July 1936 Radio Craft Cover - RF Cafe[Table of Contents]

Wax nostalgic about and learn from the history of early electronics. See articles from Radio-Craft, published 1929 - 1953. All copyrights are hereby acknowledged.

For a long time I have been scanning and posting schematics & parts lists like this one featuring the International Kadette Model 400 4-tube battery-operated superheterodyne radio in graphical format. As with all the other vintage articles posted, it requires running OCR on them to separate the textual content from the graphics. This particular Radio Service Data Sheet came from the July 1936 issue of Radio-Craft magazine. There are still many people who restore and service these vintage radios, and often it can be difficult or impossible to find schematics and/or tuning information. A fine example of a restored International Kadette Model 400 tabletop radio can be seen on the RadioMuseum.org website (click on thumbnail image). I keep a running list of all data sheets to facilitate a search.

International Kadette Model 400 4-Tube Battery-Operated Superhet. Radio Service Data Sheet

International Kadette Model 400 4-Tube Battery-Operated Superhet. Radio Service Data Sheet, July 1936 Radio-Craft - RF Cafe

International Kadette Model 400, 4-Tube Battery-Operated Superhet. Radio Service Data Sheet

The battery supply is 135 V. The I.F. transformers are aligned by feeding the signal from the service oscillator directly to the antenna. A strong signal will be necessary due to the I.F. trap circuit in the antenna lead. The broadcast range is first adjusted at 1,400 kc, The input from the oscillator must be very weak. Turn the set dial to 1,400 kc. and adjust the oscillator section of the tuning condenser (rear section) for best output. There is no adjustable padder condenser in this model and alignment at the lower frequencies is accomplished by bending sections of the oscillator condenser plates, at 1,000 and 600 kc. There is no alignment needed on the short-wave band, since the first-detector. control-grid circuit is untuned on this band. The range of the short-wave band is 70 to 200 meters. The "A" battery supply must be 4'h V. and is obtained from 3 (or any multiple of 3) dry cells connected in series (or series-parallel). The "battery saver" should be set as far counterclockwise as possible and still retain proper sensitivity and tonal quality.



Posted January 20, 2023
(updated from original post on 4/7/2016)

Radio Service Data Sheets

These schematics, tuning instructions, and other data are reproduced from my collection of vintage radio and electronics magazines. As back in the era, similar schematic and service info was available for purchase from sources such as SAMS Photofacts, but these printings were a no-cost bonus for readers. There are 227 Radio Service Data Sheets as of December 28, 2020.


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