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International Model 500 5-Tube Dual-Range Battery Superhet.
November 1936 Radio-Craft

November 1936 Radio-Craft

November 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.

I have been scanning and posting Radio Service Data Sheets like this one featuring the International Model 500 5-Tube Dual-Range Battery Superheterodyne radio receiver for many years now. 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. An Internet search did not turn up any examples of the International Model 500.

International Model 500 5-Tube Dual-Range Battery Superheterodyne

International Model 500 5-Tube Dual-Range Battery Superhet., November 1936 Radio-Craft - RF CafeThe tube voltages from socket prongs to it cannot be recharged, is also very satisfactory. If a storage cell is used, it should never be recharged while it is connected to the receiver, If dry cells are used, a series resistor should be used to cut the supply from 3 V. down to the needed 2 V. The battery connections are color coded as follows: red, "B+" 135 V.; white, "B+" 67' V.; green, "B+" 22 V.; black, "B-" ; yellow, "A+"; blue, "A-". Alignment of the I.F. circuits is accomplished by connecting the output of the test oscillator directly to the antenna, and at the same time shorting the oscillator section of the tuning condenser gang of the receiver. All 3 transformers should be carefully adjusted, starting with the one next to V1.

 

 

Posted January 20, 2017

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 220 Radio Service Data Sheets as of February 2, 2018.

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    Kirt Blattenberger,
    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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