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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Emerson Model AZ-196 (Chassis AZ) Radio Service Data Sheet
August 1938 Radio-Craft

August 1938 Radio-Craft

August 1938 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.

Emerson Model AZ-196 Tabletop Radio - RF Cafe

Emerson Model AZ−196 Tabletop Radio (RadioMuseum.org)

For a long time, I have been scanning and posting Radio Service Data Sheets like this one featuring the Emerson Model AZ−196 (Chassis AZ) tabletop radio. It appeared in the August 1938 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. Back in the day, both service shops and do-it-yourselfers relied on these documents for making repairs and tweaking the performance since manufacturers would not make the information available to anyone other than an authorized dealer. A nicely restored example of the Emerson Model AZ−196 can be seen at the left. A running list of all data sheets is at the bottom of the page to facilitate a search.

Emerson Model AZ−196 (Chassis AZ) Radio Service Data Sheet

Emerson Model AZ-196 (Chassis AZ) Radio Service Data Sheet, August 1938 Radio Craft - RF CafeAlignment:

 To align the I.F. Channel. turn tuning condenser to minimum capacity, then feed 456 kc. through a 0.02 mf. condenser to the grid cap of the 6A7 and adjust the 4 I.F. trimmers for maximum response. To adjust the wavetrap, feed 456 kc. to the antenna through a 200 mmf. condenser and adjust the trimmer screw (rear screw beside the variable condenser).

To align the short-wave band, set the dial to 15 me. Feed 15 mc. through a dummy antenna (400-chm resistor), and adjust the SW oscillator and antenna trimmers for maximum response.

To align the broadcast band, turn band switch to "broadcast" and set dial at 60. Feed a 600 kc. signal into set through a standard dummy antenna (or a 200 mmf. condenser). Adjust the broadcast series padder condenser for maximum response. Rotate dial to 140 and feed a l,400 kc. signal into the set. Adjust broadcast' oscillator and antenna trimmers for maximum response. Repeat all operations.

Adjustment of Station Buttons

To align station buttons refer to Fig. 2 for frequency ranges; wait at least 15 minutes, after turning set on, to attain a uniform temperature. Turn waveband switch to "broadcast reception" and adjust station selector knob for desired station. Then turn waveband switch to "automatic" position. Outside-of-cabinet adjustment is provided by respective buttons having' slots into which a thin coin will fit.

 

 

Posted February 16, 2022
(updated from original post on 11/7/2014)


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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