Electronics World Cover,TOC,and list of posted Popular Electronics articles QST Radio & TV News Radio-Craft Radio-Electronics Short Wave Craft Wireless World About RF Cafe RF Cafe Homepage RF Cafe in Morse Code Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs Twitter LinkedIn Crosswords Engineering Humor Kirt's Cogitations Engineering Event Calendar RF Engineering Quizzes AN/MPN-14 Radar 5CCG Notable Quotes App Notes Calculators Education Magazines Software,T-Shirts,Coffee Mugs Articles - submitted by RF Cafe visitors Simulators Technical Writings RF Cafe Archives Test Notes Wireless System Designer RF Stencils for Visio Shapes for Word Search RF Cafe Sitemap Advertising Facebook RF Cafe Forums Thank you for visiting RF Cafe!

International Model 77 Series (77-777-778-779) 7-Tube Dual-Band Receiver
Radio Service Data Sheet
June 1936 Radio-Craft

June 1936 Radio-Craft

June 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.

International Model 77 Radio (RadioMuseum.org) - RF CafeSeeing a photo of the International Model 77 'Kadette' radio reminds me of the exaggeratedly large heads of invaders in alien attack sci-fi flicks. It has to do with the small dial buried amongst the relatively large cabinet. ...but that's just me. I'm sure it was a fine radio. The thumbnail image of the International Model 77 'Kadette' radio is from the RadioMuseum.org website. Below is the Radio Service Data Sheet as it appeared in a 1936 issue of Radio-Craft magazine.

International Model 77 Series (77-777-778-779) 7-Tube Dual-Band Receiver Radio Service Data Sheet

International Model 77 Series (77-777-778-779) 7-Tube Dual-Band Receiver Radio Service Data Sheet, June 1936 Radio-Craft - RF CafeRanges: 550 to 1,600 kc, and 5,500 to 15,500 kc. (19 to 55 meters); ballast tube; airplane dial; impregnated coils.

A 15 per cent variation is permissible in these values.

Some of these sets have a 25,000-ohm resistor between the plate resistor of V3 and the coupling condenser.

The 3 trimmers on the bottom of the chassis are, reading from the end of the chassis to the center, broadcast oscillator, short-wave detector, and short-wave oscillator. No trimmer is used across the B.C. detector coil.

The I.F. alignment is made with the service oscillator connected directly to the antenna, adjusting the first, then the second units. Then feed a very weak 1,400 kc, signal to the antenna, and, with the set dial at 1,400 kc., adjust C4 for maximum" Resonance at 1,000 kc, and 600 kc. should be checked, and any needed adjustment made by bending the plates on C6. Short-wave adjustment is made at 15.5 me, at which point C3 is adjusted. Next go to 12 me. and adjust C2. At 6 mc., alignment is made by spreading or crowding turns on the S.W. detector coil.

 

 

Posted June 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 212 Radio Service Data Sheets as of August 17, 2017.

 

RF Cafe Software

   Wireless System Designer - RF Cafe
Wireless System Designer

RF & EE Symbols Word
RF Stencils for Visio
Calculator Workbook
RF Workbench
Smith Chartâ„¢ for Visio
Smith Chartâ„¢ for Excel

About RF Cafe

Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2022
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 Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:
 AirplanesAndRockets.com

Try Using SEARCH
to Find What You Need. 
There are 1,000s of Pages Indexed on RF Cafe !

height-line